ci: Use sccache on macOS

We're busting the cache, so let's switch to a cache backend with less
aggressive cache eviction.

Author: auscompgeek

.github/workflows/dist.yml

@@ -96,7 +96,7 @@ jobs:
       shell: bash
       id: ccache
       run: |
-        if [[ "${{ runner.os }}" == "Windows" ]]; then
+        if [[ "${{ runner.os }}" != "Linux" ]]; then
           echo "VARIANT=sccache" >> $GITHUB_OUTPUT
         else
           echo "VARIANT=ccache" >> $GITHUB_OUTPUT