Drop macos x86_64 from CI as Homebrew dropped it

Author: filmor

.github/actions/install-mono/action.yml

@@ -39,7 +39,7 @@ runs:
       uses: actions/cache@v5
       with:
         path: .brew-cache
-        key: mono-brew-${{ runner.os }}-${{ inputs.arch }}
+        key: mono-brew-${{ runner.os }}
 
     # ===================================
 
@@ -58,24 +58,17 @@ runs:
         if ($LASTEXITCODE) { exit $LASTEXITCODE }
       shell: pwsh
 
-    - name: Install on Windows
-      if: runner.os == 'Windows' && inputs.arch != 'x86'
+    - name: Install on Windows (x64)
+      if: runner.os == 'Windows' && inputs.arch == 'x64'
       run: |
         choco install -y mono
         if ($LASTEXITCODE) { exit $LASTEXITCODE }
       shell: pwsh
 
     # ===================================
-    #
-    - name: Install on macOS (x86_64)
-      if: runner.os == 'macOS' && inputs.arch == 'x64'
-      run: |
-        arch -x86_64 /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
-        arch -x86_64 /usr/local/bin/brew install --ignore-dependencies mono
-      shell: sh
 
     - name: Install on macOS (arm64)
-      if: runner.os == 'macOS' && inputs.arch != 'x64'
+      if: runner.os == 'macOS'
       run: |
         brew update
         brew install --ignore-dependencies mono

.github/workflows/ci.yml

@@ -64,15 +64,10 @@ jobs:
             instance: ubuntu-22.04-arm
             suffix:   ""
 
-          - category: macos
-            platform: x64
-            instance: macos-15
-            suffix:   -macos-x86_64-none
-
           - category: macos
             platform: arm64
             instance: macos-15
-            suffix:   -macos-aarch64-none
+            suffix:   ""
 
         python: ['3.15', '3.15t', '3.14t', '3.14', '3.13', '3.12', '3.11', '3.10']