GitHub actions: upgrade download/upload artifacts

Closes: AGWA#313

Author: AGWA

.github/workflows/release-linux.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Build binary
         run: make
       - name: Upload release artifact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: git-crypt-artifacts
           path: git-crypt
@@ -28,7 +28,7 @@ jobs:
       contents: write
     steps:
       - name: Download release artifact
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: git-crypt-artifacts
       - name: Upload release asset

.github/workflows/release-windows.yml

@@ -26,7 +26,7 @@ jobs:
         shell: msys2 {0}
         run: make LDFLAGS="-static-libstdc++ -static -lcrypto -lws2_32"
       - name: Upload release artifact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: git-crypt-artifacts
           path: git-crypt.exe
@@ -38,7 +38,7 @@ jobs:
       contents: write
     steps:
       - name: Download release artifact
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: git-crypt-artifacts
       - name: Upload release asset