There's no need to run `brew upgrade`.

.github/workflows/macos.yml

@@ -26,7 +26,6 @@ jobs:
       run: |
         brew update
         brew install make
-        brew upgrade
     - name: Check out repository code
       uses: actions/checkout@v4
     - name: Build

README.md

@@ -41,7 +41,7 @@ pull request to submit code:
 
 Also have a look at our contributors guide:
 
-* [Contributors Guide](https://github.com/yquake2/yquake2/blob/master/doc/080_contributing.md).
+* [Contributors Guide](https://github.com/yquake2/yquake2/blob/master/doc/080_contributing.md)
 
 
 ## Documentation