Attempt to fix 1.82 CI

Author: Manishearth

.github/workflows/main.yml

@@ -43,6 +43,14 @@ jobs:
           cargo update -p idna_adapter --precise 1.1.0
           cargo update -p getopts --precise 0.2.22
           cargo update -p unicode-width --precise 0.1.12
+          cargo update -p syn --precise 2.0.100
+      - name: Downgrade deps on Rust 1.82.0
+        if: |
+          matrix.rust == '1.82.0'
+        run: |
+          cargo update -p icu_normalizer --precise 2.0.1
+          cargo update -p icu_provider --precise 2.0.0
+          cargo update -p icu_locale_core --precise 2.0.1
       - name: Add `aarch64-unknown-none` toolchain for `no_std` tests
         if: |
           matrix.os == 'ubuntu-latest' &&