chore: retarget issue-triage agentic workflow to stable gh-aw v0.83.1

Bump the gh-aw compiler from v0.83.0 to the latest stable release v0.83.1
and recompile the issue-triage workflow. Scope is unchanged: only the
issue-triage source/lock plus the directly required shared action lock;
the maintenance workflow stays suppressed via aw.json.

Source issue-triage.md is unchanged: frontmatter_hash and body_hash are
identical, so the add-labels issue-intent enablement and all workflow
behavior are preserved. Generated changes only:

- issue-triage.lock.yml: compiler v0.83.0->v0.83.1, AWF v0.27.37->v0.27.38.
- .github/aw/actions-lock.json: setup action v0.83.0->v0.83.1 (v0.83.1 no
  longer emits a separate setup-cli entry).

Validated with `gh aw compile` (v0.83.1) and `gh aw validate` (0 errors,
0 warnings); idempotent on re-compile, maintenance workflow not regenerated.

Refs github/plan-track-agentic-toolkit#519

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 628d4172-49f6-4d5c-905c-a33276de3aee

Author: alondahari

.github/aw/actions-lock.json

@@ -1,14 +1,9 @@
 {
   "entries": {
-    "github/gh-aw-actions/setup-cli@v0.83.0": {
-      "repo": "github/gh-aw-actions/setup-cli",
-      "version": "v0.83.0",
-      "sha": "34802437a0cba2fd1352d1f1bb02c18a78b56b31"
-    },
-    "github/gh-aw-actions/setup@v0.83.0": {
+    "github/gh-aw-actions/setup@v0.83.1": {
       "repo": "github/gh-aw-actions/setup",
-      "version": "v0.83.0",
-      "sha": "34802437a0cba2fd1352d1f1bb02c18a78b56b31"
+      "version": "v0.83.1",
+      "sha": "8bdba8075360648fe6802302a5b4e016361dc6ac"
     }
   }
 }