ci: use macos-13

`macos-12` has been deprecated: ``` The macOS-12 environment is deprecated, consider switching to macOS-13, macOS-14 (macos-latest) or macOS-15. For more details, see actions/runner-images#10721 ```
cedarcode · Dec 13, 2024 · 0c07949 · 0c07949
1 parent c84b451
commit 0c07949
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
@@ -22,7 +22,7 @@ jobs:
         os:
           - ubuntu-20.04
           - windows-latest
-          - macos-12
+          - macos-13
         ruby:
           - '3.2'
           - '3.1'