Ensure cached archives are cleared for upgrades

Instead of caching the downloaded archives for RE2 and Abseil based on
the contents of extconf.rb, cache them based on the contents of
dependencies.yml which will change every time the archives are updated.

.github/workflows/precompile-gem.yml

@@ -19,7 +19,7 @@ jobs:
       - uses: actions/cache@v4
         with:
           path: ports/archives
-          key: archives-ubuntu-${{ hashFiles('ext/re2/extconf.rb') }}
+          key: archives-ubuntu-${{ hashFiles('dependencies.yml') }}
       - run: bundle exec rake gem:${{ inputs.platform }}
       - uses: actions/upload-artifact@v4
         with:

.github/workflows/tests.yml

@@ -22,7 +22,7 @@ jobs:
       - uses: actions/cache@v4
         with:
           path: ports/archives
-          key: archives-ubuntu-${{ hashFiles('ext/re2/extconf.rb') }}
+          key: archives-ubuntu-${{ hashFiles('dependencies.yml') }}
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: "3.3"
@@ -462,7 +462,7 @@ jobs:
       - uses: actions/cache@v4
         with:
           path: ports/archives
-          key: archives-ubuntu-${{ hashFiles('ext/re2/extconf.rb') }}
+          key: archives-ubuntu-${{ hashFiles('dependencies.yml') }}
       - uses: ruby/setup-ruby-pkgs@v1
         with:
           ruby-version: "3.3"