Add agentic workflow to check for new JDK releases

Runs on March 15 and September 15 (aligned with OpenJDK release cadence).
Checks openjdk.org for new GA releases, researches finalized features,
and creates a PR with new snippet cards for the site.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: brunoborges

.gitattributes

@@ -0,0 +1 @@
+.github/workflows/*.lock.yml linguist-generated=true merge=ours

.github/aw/actions-lock.json

@@ -0,0 +1,9 @@
+{
+  "entries": {
+    "actions/github-script@v8": {
+      "repo": "actions/github-script",
+      "version": "v8",
+      "sha": "ed597411d8f924073f98dfc5c65a23a2325f34cd"
+    }
+  }
+}