Use macos-12 runner for MacOS builds (3)

.github/actions/setup-macos/action.yml

@@ -53,10 +53,10 @@ runs:
       shell: bash
       run: cat common.env >> $GITHUB_ENV
 
-    - name: Select XCode 12.4 & SDK 11.1
+    - name: Select XCode 13.1
       uses: maxim-lobanov/setup-xcode@v1
       with:
-        xcode-version: '12.4'
+        xcode-version: '13.1'
 
     - name: Install packages
       shell: bash

.github/workflows/gem-test-and-release.yml

@@ -132,7 +132,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [  macos-12.0  ]
+        os: [  macos-12  ]
         package_ruby_ver: [ '3.1.4' ]
         env:
           - { CC: clang, CXX: clang++ }

.github/workflows/macos.yml

@@ -60,7 +60,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ macos-12.0 ]
+        os: [ macos-12 ]
     steps:
       - name: Checkout tebako packaging environment
         uses: actions/checkout@v4
@@ -86,7 +86,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ macos-12.0 ]
+        os: [ macos-12 ]
         package_ruby_ver: [ '3.1.4', '3.2.3' ]
     steps:
       - name: Checkout tebako packaging environment
@@ -111,7 +111,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ macos-12.0 ]
+        os: [ macos-12 ]
         package_ruby_ver: [ '3.1.4', '3.2.3' ]
     steps:
       - name: Checkout tebako packaging environment
@@ -136,7 +136,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ macos-11.0, macos-13.0 ]
+        os: [ macos-11, macos-13 ]
     runs-on: ${{ matrix.os }}
     steps:
       - name: Download test packages

README.adoc

@@ -34,7 +34,7 @@ In the future:
 The Tebako packager is tested on the following platforms:
 
 * Linux: Ubuntu 20.04; Alpine 3.17
-* macOS: macOS 11.0 (Monterey)
+* macOS: macOS 11 (Big Sur), 12 (Monterey), 13 (Ventura)
 * Windows: TBD
 
 == Supported Ruby versions