ci: test on MacOS 13

Author: aminya

.github/workflows/CI.yml

@@ -146,6 +146,7 @@ jobs:
           - windows-2019
           - ubuntu-22.04
           - ubuntu-20.04
+          - macos-13
           - macos-12
           - macos-11
         node:

README.md

@@ -8,7 +8,7 @@ Setting up a **cross-platform** environment for building and testing C++/C proje
 
 `setup-cpp` can be used locally from terminal, from CI services like GitHub Actions and GitLab Pipelines, and inside containers like Docker.
 
-`setup-cpp` is supported on many platforms. It is continuously tested on several configurations including Windows (11, 10, 2022, 2019), Linux (Ubuntu 22.04, Ubuntu 20.04, Fedora, ArchLinux), and macOS (12, 11, 10.15). `setup-cpp` is backed by unit tests for each tool and integration tests for compiling cpp projects.
+`setup-cpp` is supported on many platforms. It is continuously tested on several configurations including Windows (11, 10, 2022, 2019), Linux (Ubuntu 22.04, Ubuntu 20.04, Fedora, ArchLinux), and macOS (13, 12, 11, 10.15). `setup-cpp` is backed by unit tests for each tool and integration tests for compiling cpp projects.
 
 ## Features