Bump AI Issue Triage gh-aw engine and image versions (#49885)

## Summary

The **AI Issue Triage** agentic workflow ([run
31779057901](https://github.com/microsoft/PowerToys/actions/runs/31779057901/job/94700789335))
failed at the **Execute GitHub Copilot CLI** step. The Copilot CLI
binary was missing at `/usr/local/bin/copilot` inside the AWF firewall
agent container:

```
[copilot-harness] pre-flight: command not found: /usr/local/bin/copilot (F_OK check failed — binary does not exist at this path)
[copilot-harness] attempt 1: failed to start process '/usr/local/bin/copilot': spawn /usr/local/bin/copilot ENOENT
[copilot-harness] attempt 1: no output produced — not retrying
```

With no output produced, the harness exited with code 1 and the job
failed.

## Change

Recompiled the workflow with `gh aw upgrade` (gh-aw `v0.84.3` →
`v0.86.2`), which refreshes the pinned engine, images and actions —
including the agent container image that ships the Copilot CLI binary.

| Component | Before | After |
| --- | --- | --- |
| `github/gh-aw-actions/setup` | `v0.84.3` | `v0.86.2` |
| gh-aw compiler | `v0.84.3` | `v0.86.2` |
| AWF firewall (agent/api-proxy/squid) | `0.27.43` | `0.27.44` |
| Copilot CLI (agent) | `1.0.77` | `1.0.79` |
| `gh-aw-mcpg` | `v0.4.7` | `v0.4.9` |
| `github-mcp-server` | `v1.8.0` | `v1.9.0` |

All container images are digest-pinned; digests were verified against
GHCR.

## Files
- `.github/workflows/issue-triage.md` — engine/action version
normalization
- `.github/workflows/issue-triage.lock.yml` — recompiled lock file
- `.github/aw/actions-lock.json` — bumped `gh-aw-actions/setup` pin

Generated with the GitHub Copilot CLI.

Co-authored-by: niels9001 <niels9001@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 26025067-259e-43e3-9dc7-a9fc4b5ba58b

.github/aw/actions-lock.json

@@ -1,9 +1,9 @@
 {
   "entries": {
-    "github/gh-aw-actions/setup@v0.84.3": {
+    "github/gh-aw-actions/setup@v0.86.2": {
       "repo": "github/gh-aw-actions/setup",
-      "version": "v0.84.3",
-      "sha": "c863074b673419603d146aab585e2986ef08deec"
+      "version": "v0.86.2",
+      "sha": "6aab9e5b5c91c615506061f09bedd81a23babe3c"
     }
   }
 }

.github/workflows/issue-triage.md

@@ -27,7 +27,7 @@ permissions:
   copilot-requests: write
 steps:
   - name: Set up Python
-    uses: actions/setup-python@v7
+    uses: actions/setup-python@v7.0.0
     with:
       python-version: "3.12"
   - name: Prepare deterministic issue evidence
@@ -125,7 +125,7 @@ safe-outputs:
           options: [ENGLISH, NON_ENGLISH, UNCERTAIN]
       steps:
         - name: Upsert canonical triage summary
-          uses: actions/github-script@v9
+          uses: actions/github-script@v9.0.0
           with:
             script: |
               const fs = require('fs');