Add Dependabot PR triage agentic workflow (#60034)

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

Author: heiskr

.gitattributes

@@ -4,3 +4,4 @@
 # to native line endings on checkout.
 *.md text diff=markdown
 *.json.br filter=lfs diff=lfs merge=lfs -text
+.github/workflows/*.lock.yml linguist-generated=true merge=ours

.github/aw/actions-lock.json

@@ -0,0 +1,14 @@
+{
+  "entries": {
+    "actions/github-script@v8": {
+      "repo": "actions/github-script",
+      "version": "v8",
+      "sha": "ed597411d8f924073f98dfc5c65a23a2325f34cd"
+    },
+    "github/gh-aw/actions/setup@v0.50.5": {
+      "repo": "github/gh-aw/actions/setup",
+      "version": "v0.50.5",
+      "sha": "a7d371cc7e68f270ded0592942424548e05bf1c2"
+    }
+  }
+}