fix: macos gem tests and compatibility notes

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

@@ -101,7 +101,7 @@ runs:
             echo "CC=${{ inputs.cc || 'clang' }}" >> $GITHUB_ENV
             echo "CXX=${{ inputs.cxx || 'clang++' }}" >> $GITHUB_ENV
             if [ "${{ runner.arch }}" = "X64" ]; then
-              echo "XCODE_VERSION=${{ inputs.xcode || '13.1' }}" >> $GITHUB_ENV
+              echo "XCODE_VERSION=${{ inputs.xcode || '14.3.1' }}" >> $GITHUB_ENV
               echo "TOOLCHAIN=macos-x86_64" >> $GITHUB_ENV
             else
               echo "XCODE_VERSION=${{ inputs.xcode || '15.0.1' }}" >> $GITHUB_ENV

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

@@ -215,7 +215,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ macos-13 macos-14 ]
+        os: [ macos-13, macos-14 ]
         gem: [ metanorma, fontist ]
         package_ruby_ver: [ '3.2.5' ]
         env:

README.adoc

@@ -114,7 +114,7 @@ executed on a newer version of the same platform.
 macOS packages are forward portable across different macOS versions.
 
 [example]
-A Tebako executable package built on macOS 12 (Monterey) can be executed on
+A Tebako executable package built on macOS 13 (Ventura) can be executed on
 macOS 14 (Sonoma), but not vice versa.
 
 `x86_64` macOS packages can be run on Apple M (ARM) systems.
@@ -562,7 +562,7 @@ There are several prerequisites that need to be installed on macOS for Tebako to
 
 The following instructions work for:
 
-* macOS 12 (Monterey) through macOS 14 (Sonoma)
+* macOS 13 (Ventura) through macOS 15 (Sequoia)
 
 
 ====== Homebrew packages