Update actionlint Docker image to 20260311 (#352)

* Update actionlint Docker image to 20260311

* Add macos-26-intel to actionlint custom labels

Author: SeanTAllen

.github/actionlint.yaml

@@ -2,4 +2,4 @@
 self-hosted-runner:
   labels:
     - windows-11-arm
-    - macos-15-intel
+    - macos-26-intel

.github/workflows/lint-action-workflows.yml

@@ -17,6 +17,6 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4.1.1
       - name: Check workflow files
-        uses: docker://ghcr.io/ponylang/shared-docker-ci-actionlint:20260120
+        uses: docker://ghcr.io/ponylang/shared-docker-ci-actionlint:20260311
         with:
           args: -color