Rollup merge of #141382 - marcoieni:distcheck-free-x86, r=Kobzol

ci: convert distcheck to free runner

try-job: x86_64-gnu-distcheck

Author: matthiaskrgr

src/ci/github-actions/jobs.yml

@@ -324,7 +324,7 @@ auto:
     <<: *job-linux-4c
 
   - name: x86_64-gnu-distcheck
-    <<: *job-linux-8c
+    <<: *job-linux-4c
 
   # The x86_64-gnu-llvm-20 job is split into multiple jobs to run tests in parallel.
   # x86_64-gnu-llvm-20-1 skips tests that run in x86_64-gnu-llvm-20-{2,3}.