chore(deps): Bump actions/github-script from 7 to 9 (#403)

Bumps [actions/github-script](https://github.com/actions/github-script) from 7 to 9.
- [Release notes](https://github.com/actions/github-script/releases)
- [Commits](actions/github-script@v7...v9)

---
updated-dependencies:
- dependency-name: actions/github-script
  dependency-version: '9'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/squad-heartbeat.yml

@@ -48,7 +48,7 @@ jobs:
 
       - name: Ralph — Apply triage decisions
         if: steps.check-script.outputs.has_script == 'true' && hashFiles('triage-results.json') != ''
-        uses: actions/github-script@v7
+        uses: actions/github-script@v9
         with:
           script: |
             const fs = require('fs');
@@ -100,7 +100,7 @@ jobs:
       # Copilot auto-assign step (uses PAT if available)
       - name: Ralph — Assign @copilot issues
         if: success()
-        uses: actions/github-script@v7
+        uses: actions/github-script@v9
         with:
           github-token: ${{ secrets.COPILOT_ASSIGN_TOKEN || secrets.GITHUB_TOKEN }}
           script: |

.github/workflows/squad-issue-assign.yml

@@ -17,7 +17,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Identify assigned member and trigger work
-        uses: actions/github-script@v7
+        uses: actions/github-script@v9
         with:
           script: |
             const fs = require('fs');
@@ -116,7 +116,7 @@ jobs:
       # Separate step: assign @copilot using PAT (required for coding agent)
       - name: Assign @copilot coding agent
         if: github.event.label.name == 'squad:copilot'
-        uses: actions/github-script@v7
+        uses: actions/github-script@v9
         with:
           github-token: ${{ secrets.COPILOT_ASSIGN_TOKEN }}
           script: |

.github/workflows/squad-label-enforce.yml

@@ -15,7 +15,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Enforce mutual exclusivity
-        uses: actions/github-script@v7
+        uses: actions/github-script@v9
         with:
           script: |
             const issue = context.payload.issue;

.github/workflows/squad-triage.yml

@@ -16,7 +16,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Triage issue via Lead agent
-        uses: actions/github-script@v7
+        uses: actions/github-script@v9
         with:
           script: |
             const fs = require('fs');

.github/workflows/sync-squad-labels.yml

@@ -18,7 +18,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Parse roster and sync labels
-        uses: actions/github-script@v7
+        uses: actions/github-script@v9
         with:
           script: |
             const fs = require('fs');

.github/workflows/weekly-regression-loop.yml

@@ -51,7 +51,7 @@ jobs:
 
       - name: Find previous successful baseline run
         id: baseline
-        uses: actions/github-script@v7
+        uses: actions/github-script@v9
         with:
           script: |
             const owner = context.repo.owner;
@@ -115,7 +115,7 @@ jobs:
 
       - name: Evaluate regression status
         id: regression
-        uses: actions/github-script@v7
+        uses: actions/github-script@v9
         env:
           RUN_EXIT: ${{ steps.run_eval.outputs.run_exit }}
         with:
@@ -251,7 +251,7 @@ jobs:
 
       - name: Upsert regression issue
         if: steps.regression.outputs.regression == 'true'
-        uses: actions/github-script@v7
+        uses: actions/github-script@v9
         env:
           SUMMARY: ${{ steps.regression.outputs.summary }}
         with: