Cleanup MacOS CI

* ci: Test macos-12 and macos-13 instead of macos-11 and macos-12
  Developer survey shows little to no users still use MacOS 11 or earlier.
* Remove pointless comment about travis
* Fix minor indent issue

.github/workflows/continuous_integration.yml

@@ -1,9 +1,3 @@
-# NOTE: This workflow was ported from Travis.
-# Travis was using Ubuntu 14.04. Ubuntu 14.04 is not supportted by GitHub workflows. Ubuntu 20.04 is recommended.
-# Travis was using Clang 3.6. The earliest version support by Ubuntu 20.04 is Clang 6.0.
-# Travis was caching the clang package. APT package caching is not natively supported by GitHub actions/cache.
-# Travis was using Mac OS X 10.13.6 / Xcode 9.4.1 / LLVM 9.1.0
-#
 name: Continuous Integration
 
 on:
@@ -89,7 +83,7 @@ jobs:
       - name: Test (standalone)
         run: cd Test && ./runtests
 
-      # Ensure we can compile/run on an older distro
+  # Ensure we can compile/run on an older distro
   linux_min:
     name: Linux Backcompat
     runs-on: ubuntu-20.04
@@ -125,29 +119,23 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [macos-11, macos-12]
+        os: [macos-12, macos-13]
         compiler: [{cc: clang, cxx: clang++}, {cc: gcc, cxx: g++}]
         cmake_build_type: [Debug, Release]
     steps:
       - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
-      - uses: actions/setup-python@65d7f2d534ac1bc67fcd62888c5f4f3d2cb2b236 # v4.7.1
-        with:
-          python-version: '3.7'
       - uses: lukka/get-cmake@8be6cca406b575906541e8e3b885d46f416bba39 # v3.27.7
       - run: ./update_glslang_sources.py
-      - name: Configure
-        run: cmake -S . -B build -D CMAKE_BUILD_TYPE=${{matrix.cmake_build_type}} -G "Ninja"
+      - run: cmake -S . -B build -D CMAKE_BUILD_TYPE=${{matrix.cmake_build_type}} -G Ninja
         env:
           CC: ${{matrix.compiler.cc}}
           CXX: ${{matrix.compiler.cxx}}
-      - name: Build
-        run: cmake --build build
-      - name: Install
-        run: cmake --install build --prefix build/install
-      - name: Test
-        run: ctest --output-on-failure --test-dir build
-      - name: Test (standalone)
-        run: cd Test && ./runtests
+      - run: cmake --build build
+      - run: cmake --install build --prefix build/install
+      - run: ctest --output-on-failure --test-dir build
+      - name: Test Script (standalone)
+        run: ./runtests
+        working-directory: Test
 
   windows:
     runs-on: ${{matrix.os.genus}}