switch to macos-11 as 12 doesn't have toolchain

Author: gdams

.github/workflows/build-macos.yml

@@ -49,7 +49,7 @@ on:
 jobs:
   build-macos:
     name: build
-    runs-on: macos-12
+    runs-on: macos-11
 
     strategy:
       fail-fast: false

.github/workflows/main.yml

@@ -204,7 +204,7 @@ jobs:
     uses: ./.github/workflows/build-macos.yml
     with:
       platform: macos-x64
-      xcode-toolset-version: '13.3.1'
+      xcode-toolset-version: '11.7'
     if: needs.select.outputs.macos-x64 == 'true'
 
   build-macos-aarch64:
@@ -213,7 +213,7 @@ jobs:
     uses: ./.github/workflows/build-macos.yml
     with:
       platform: macos-aarch64
-      xcode-toolset-version: '13.3.1'
+      xcode-toolset-version: '12.4'
       extra-conf-options: '--openjdk-target=aarch64-apple-darwin'
     if: needs.select.outputs.macos-aarch64 == 'true'
 
@@ -271,7 +271,7 @@ jobs:
     with:
       platform: macos-x64
       bootjdk-platform: macos-x64
-      runs-on: macos-12
+      runs-on: macos-11
 
   test-windows-x64:
     name: windows-x64

.github/workflows/test.yml

@@ -127,7 +127,7 @@ jobs:
         run: |
           # On macOS we need to install some dependencies for testing
           brew install make
-          sudo xcode-select --switch /Applications/Xcode_11.3.1.app/Contents/Developer
+          sudo xcode-select --switch /Applications/Xcode_11.7.app/Contents/Developer
           # This will make GNU make available as 'make' and not only as 'gmake'
           echo '/usr/local/opt/make/libexec/gnubin' >> $GITHUB_PATH
         if: runner.os == 'macOS'