ci(*): replace deprecated macos-13 runner image with macos-15-intel (#511)

This pull request updates the supported macOS runner versions for CI
workflows and documentation, removing references to the deprecated
`macos-13` runners and introducing `macos-15-intel` as the new x64 build
and test environment. These changes ensure the project uses currently
supported and available GitHub Actions runners, improving compatibility
and reliability.

**CI Workflow Updates:**

* Replaced `macos-13` (x64) with `macos-15-intel` in the build matrix
for `.github/workflows/llvm-build-bump-pr.yml`, ensuring x64 builds use
the latest supported runner.
* Updated the test matrix in `.github/workflows/test-cross-platform.yml`
to add `macos-15-intel` and remove `macos-13`, aligning test
environments with available runners.

**Documentation Updates:**

* Removed `macOS 13` and `macOS 13 Arm64` from the supported runners
table in `website/docs/get-started/supported.md`, reflecting the
deprecation of these environments.
* Updated the binary build/test image table in
`website/docs/get-started/supported.md` to use `macos-15-intel` for
`darwin-x64` builds and tests instead of `macos-13`.

Author: lumirlumir

.github/workflows/llvm-build-bump-pr.yml

@@ -283,8 +283,8 @@ jobs:
       fail-fast: false
       matrix:
         type:
-          - macos-14 # arm64 (macos-latest: arm64)
-          - macos-13 # x64 (macos-12(deprecated): x64)
+          - macos-15-intel # x64
+          - macos-14 # arm64
 
     # Use the oldest version possible for backward compatibility.
     runs-on: ${{ matrix.type }}

.github/workflows/test-cross-platform.yml

@@ -58,9 +58,9 @@ jobs:
       fail-fast: false
       matrix:
         runner-image:
+          - macos-15-intel
           - macos-15
           - macos-14
-          - macos-13
           - ubuntu-24.04
           - ubuntu-22.04
           - windows-2025

website/docs/get-started/supported.md

@@ -53,8 +53,6 @@ macOS 15                     | `macos-15-large`
 macOS 15 Arm64               | `macos-15` or `macos-15-xlarge`                                        | macOS-15-arm64    |
 macOS 14                     | `macos-latest-large` or `macos-14-large`                               | macOS-14          |
 macOS 14 Arm64               | `macos-latest`, `macos-14`, `macos-latest-xlarge` or `macos-14-xlarge` | macOS-14-arm64    |
-macOS 13                     | `macos-13` or `macos-13-large`                                         | macOS-13          |
-macOS 13 Arm64               | `macos-13-xlarge`                                                      | macOS-13-arm64    |
 Ubuntu 24.04                 | `ubuntu-latest` or `ubuntu-24.04`                                      | ubuntu-24.04      |
 Ubuntu 22.04                 | `ubuntu-22.04`                                                         | ubuntu-22.04      |
 Windows Server 2022          | `windows-latest` or `windows-2022`                                     | windows-2022      |
@@ -77,7 +75,7 @@ We used the following Images to build `clang-format` excuatable binaries.
 Binary Folder Name | Docker **Build** Image                                             | Docker **Test** Image                                              |
 ------------------ | ------------------------------------------------------------------ | ------------------------------------------------------------------ |
 `darwin-arm64`     | GitHub Actions runner `macos-14`                                   | GitHub Actions runner `macos-14`                                   |
-`darwin-x64`       | GitHub Actions runner `macos-13`                                   | GitHub Actions runner `macos-13`                                   |
+`darwin-x64`       | GitHub Actions runner `macos-15-intel`                             | GitHub Actions runner `macos-15-intel`                             |
 `linux-arm`        | [`python:3.10.18-bullseye`](https://hub.docker.com/_/python)       | [`arm32v7/ubuntu:22.04`](https://hub.docker.com/r/arm32v7/ubuntu/) |
 `linux-arm64`      | [`python:3.10.18-bullseye`](https://hub.docker.com/_/python)       | [`arm64v8/ubuntu:22.04`](https://hub.docker.com/r/arm64v8/ubuntu/) |
 `linux-ppc64`      | [`buildpack-deps:jammy`](https://hub.docker.com/_/buildpack-deps/) | [`ppc64le/ubuntu:22.04`](https://hub.docker.com/r/ppc64le/ubuntu/) |