Update .github/workflows/docker.yml

Co-authored-by: Bo Anderson <[email protected]>

.github/workflows/docker.yml

@@ -81,7 +81,7 @@ jobs:
           fi
           if [[ "${{ matrix.version }}" == "18.04" ]]; then
             # odeprecated: remove this in Homebrew >=4.4
-            echo "homebrew/ubuntu18.04:master is deprecated and will soon be retired. Use homebrew/ubuntu22.04:master or homebrew/ubuntu24.04 or homebrew/ubuntu20.04 or homebrew/brew. For CI, homebrew/ubuntu22.04:master is recommended." > .docker-deprecate
+            echo "The homebrew/ubuntu18.04 image is deprecated and will soon be retired. Use homebrew/ubuntu22.04 or homebrew/ubuntu24.04 or homebrew/ubuntu20.04 or homebrew/brew." > .docker-deprecate
           fi
 
           {