Update Cache, Add Further MacOS Tests, Remove Deprecated 12

Author: joshw123

.github/workflows/tests.yml

@@ -8,7 +8,7 @@ jobs:
   test-bot:
     strategy:
       matrix:
-        os: [ubuntu-22.04, macos-12]
+        os: [ubuntu-22.04, macos-15, macos-14, macos-13]
     runs-on: ${{ matrix.os }}
     steps:
       - name: Set up Homebrew
@@ -17,7 +17,7 @@ jobs:
 
       - name: Cache Homebrew Bundler RubyGems
         id: cache
-        uses: actions/cache@v1
+        uses: actions/cache@v4
         with:
           path: ${{ steps.set-up-homebrew.outputs.gems-path }}
           key: ${{ runner.os }}-rubygems-${{ steps.set-up-homebrew.outputs.gems-hash }}