Update actions/github-script action to v7 (open-telemetry#8883)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/github-script](https://togithub.com/actions/github-script) |
action | major | `v6` -> `v7` |

---

### Release Notes

<details>
<summary>actions/github-script (actions/github-script)</summary>

### [`v7`](https://togithub.com/actions/github-script/compare/v6...v7)

[Compare
Source](https://togithub.com/actions/github-script/compare/v6...v7)

</details>

---

### Configuration

📅 **Schedule**: Branch creation - "on tuesday" (UTC), Automerge - At any
time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you
are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

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.github/workflows/builder-release.yaml

@@ -31,7 +31,7 @@ jobs:
           gh release create ${{ github.ref_name }} -t ${{ github.ref_name }} -n "### Images and binaries here: https://github.com/open-telemetry/opentelemetry-collector-releases/releases/tag/${{ github.ref_name }}"
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-      - uses: actions/github-script@v6
+      - uses: actions/github-script@v7
         with:
           script: |
             const milestones = await github.rest.issues.listMilestones({

.github/workflows/milestone-add-to-pr.yml

@@ -12,7 +12,7 @@ jobs:
     if: github.event.pull_request.merged
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/github-script@v6
+      - uses: actions/github-script@v7
         with:
           script: |
             const milestones = await github.rest.issues.listMilestones({