ci: use stable-selftests tag

Use the stable-selftests tag instead of $VERSION-selftests, since the
latter is going away.

Signed-off-by: Lorenz Bauer <[email protected]>

Author: lmb

.github/workflows/ci.yml

@@ -128,10 +128,10 @@ jobs:
         env:
           GOTRACEBACK: crash
         run: |
-          gotestsum --raw-command --ignore-non-json-output-lines --junitfile junit.xml -- vimto -kernel :${CI_MAX_KERNEL_VERSION}-selftests -- go test -timeout 5m -short -count 1 -json ./...
+          gotestsum --raw-command --ignore-non-json-output-lines --junitfile junit.xml -- vimto -kernel :stable-selftests -- go test -timeout 5m -short -count 1 -json ./...
 
       - name: Benchmark
-        run: vimto -kernel :${CI_MAX_KERNEL_VERSION}-selftests -- go test -short -run '^$' -bench . -benchtime=1x ./...
+        run: vimto -kernel :stable-selftests -- go test -short -run '^$' -bench . -benchtime=1x ./...
 
       - name: Upload coredumps
         uses: actions/upload-artifact@v4