chore(deps): ⬆️ update actions/stale action to v8 (#7)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/stale](https://togithub.com/actions/stale) | action | major | `v7` -> `v8` |

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### Release Notes

<details>
<summary>actions/stale</summary>

### [`v8`](https://togithub.com/actions/stale/compare/v7...v8)

[Compare Source](https://togithub.com/actions/stale/compare/v7...v8)

</details>

---

### Configuration

📅 **Schedule**: Branch creation - "after 12am and before 5am every weekday,every weekend" in timezone Asia/Kolkata, Automerge - At any time (no schedule defined).

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

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

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

---

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

---

This PR has been generated by [Mend Renovate](https://www.mend.io/free-developer-tools/renovate/). View repository job log [here](https://app.renovatebot.com/dashboard#github/timelessco/node-js-app-template).

Author: renovate[bot]

.github/workflows/stale-issues.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: "ubuntu-latest"
 
     steps:
-      - uses: "actions/stale@v7"
+      - uses: "actions/stale@v8"
         with:
           repo-token: "${{ secrets.GITHUB_TOKEN }}"
           stale-issue-message: |
@@ -35,7 +35,7 @@ jobs:
     runs-on: "ubuntu-latest"
 
     steps:
-      - uses: "actions/stale@v7"
+      - uses: "actions/stale@v8"
         with:
           repo-token: "${{ secrets.GITHUB_TOKEN }}"
           stale-issue-message: |
@@ -50,7 +50,7 @@ jobs:
     timeout-minutes: 1
     runs-on: "ubuntu-latest"
     steps:
-      - uses: "actions/stale@v7"
+      - uses: "actions/stale@v8"
         with:
           repo-token: "${{ secrets.GITHUB_TOKEN }}"
           stale-issue-message: |
@@ -67,7 +67,7 @@ jobs:
     runs-on: "ubuntu-latest"
 
     steps:
-      - uses: "actions/stale@v7"
+      - uses: "actions/stale@v8"
         with:
           repo-token: "${{ secrets.GITHUB_TOKEN }}"
           stale-issue-message: |