Bump signature to v2.3.0-pre.0; MSRV 1.71

For `ecdsa` crate: MSRV is 1.73 due to a bump of `elliptic-curve` to
v0.14.0-pre.0.

This commit begins the next round of breaking changes and bumps all
crates to prerelease versions.

The main change in `signature` is an upgrade of the `digest` crate to
v0.11.0-pre.3, which is what brings the new MSRV 1.71 requirement.

Author: tarcieri

.github/workflows/dsa.yml

@@ -24,7 +24,7 @@ jobs:
           - thumbv7em-none-eabi
           - wasm32-unknown-unknown
         toolchain:
-          - 1.65.0 # MSRV
+          - 1.71.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v4
@@ -42,7 +42,7 @@ jobs:
           - macos-latest
           - windows-latest
         toolchain:
-          - 1.65.0 # MSRV
+          - 1.71.0 # MSRV
           - stable
     runs-on: ${{ matrix.platform }}
     steps:

.github/workflows/ecdsa.yml

@@ -26,7 +26,7 @@ jobs:
           - thumbv7em-none-eabi
           - wasm32-unknown-unknown
         rust:
-          - 1.65.0 # MSRV
+          - 1.73.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v4
@@ -42,7 +42,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.65.0 # MSRV
+          - 1.73.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v4

.github/workflows/ed25519.yml

@@ -24,7 +24,7 @@ jobs:
           - thumbv7em-none-eabi
           - wasm32-unknown-unknown
         toolchain:
-          - 1.60.0 # MSRV
+          - 1.71.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v4
@@ -34,16 +34,15 @@ jobs:
           toolchain: ${{ matrix.toolchain }}
       - run: cargo build --target ${{ matrix.target }} --release --no-default-features
       - run: cargo build --target ${{ matrix.target }} --release --no-default-features --features alloc
-      # TODO(tarcieri): re-enable the following when MSRV is 1.65
-      #- run: cargo build --target ${{ matrix.target }} --release --no-default-features --features pem
-      #- run: cargo build --target ${{ matrix.target }} --release --no-default-features --features pkcs8
-      #- run: cargo build --target ${{ matrix.target }} --release --no-default-features --features alloc,pem,pkcs8
+      - run: cargo build --target ${{ matrix.target }} --release --no-default-features --features pem
+      - run: cargo build --target ${{ matrix.target }} --release --no-default-features --features pkcs8
+      - run: cargo build --target ${{ matrix.target }} --release --no-default-features --features alloc,pem,pkcs8
 
   test:
     strategy:
       matrix:
         toolchain:
-          - 1.65.0 # Technically MSRV is 1.60, but we have 1.65 dev-dependencies (i.e. ring-compat)
+          - 1.71.0 # MSRV
           - stable
     runs-on: ubuntu-latest
     steps:

.github/workflows/ed448.yml

@@ -24,7 +24,7 @@ jobs:
           - thumbv7em-none-eabi
           - wasm32-unknown-unknown
         toolchain:
-          - 1.60.0 # MSRV
+          - 1.71.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v4
@@ -34,16 +34,15 @@ jobs:
           toolchain: ${{ matrix.toolchain }}
       - run: cargo build --target ${{ matrix.target }} --release --no-default-features
       - run: cargo build --target ${{ matrix.target }} --release --no-default-features --features alloc
-      # TODO(tarcieri): re-enable the following when MSRV is 1.65
-      #- run: cargo build --target ${{ matrix.target }} --release --no-default-features --features pem
-      #- run: cargo build --target ${{ matrix.target }} --release --no-default-features --features pkcs8
-      #- run: cargo build --target ${{ matrix.target }} --release --no-default-features --features alloc,pem,pkcs8
+      - run: cargo build --target ${{ matrix.target }} --release --no-default-features --features pem
+      - run: cargo build --target ${{ matrix.target }} --release --no-default-features --features pkcs8
+      - run: cargo build --target ${{ matrix.target }} --release --no-default-features --features alloc,pem,pkcs8
 
   test:
     strategy:
       matrix:
         toolchain:
-          - 1.65.0 # Technically MSRV is 1.60, but we have 1.65 dev-dependencies (i.e. ring-compat)
+          - 1.71.0 # MSRV
           - stable
     runs-on: ubuntu-latest
     steps:

.github/workflows/rfc6979.yml

@@ -24,7 +24,7 @@ jobs:
           - thumbv7em-none-eabi
           - wasm32-unknown-unknown
         rust:
-          - 1.61.0 # MSRV
+          - 1.71.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v4
@@ -39,7 +39,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.61.0 # MSRV
+          - 1.71.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v4

.github/workflows/workspace.yml

@@ -29,6 +29,6 @@ jobs:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: 1.66.0
+          toolchain: 1.73.0
           components: clippy
       - run: cargo clippy --all-features -- -D warnings