chore(deps): update google-github-actions/get-secretmanager-secrets action to v3 (#239)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[google-github-actions/get-secretmanager-secrets](https://redirect.github.com/google-github-actions/get-secretmanager-secrets)
| action | major | `v2.2.5` -> `v3.0.0` |

---

### Release Notes

<details>
<summary>google-github-actions/get-secretmanager-secrets
(google-github-actions/get-secretmanager-secrets)</summary>

###
[`v3.0.0`](https://redirect.github.com/google-github-actions/get-secretmanager-secrets/releases/tag/v3.0.0)

[Compare
Source](https://redirect.github.com/google-github-actions/get-secretmanager-secrets/compare/v2.2.5...v3.0.0)

#### What's Changed

- Bump to Node 24 by
[@&#8203;sethvargo](https://redirect.github.com/sethvargo) in
[#&#8203;324](https://redirect.github.com/google-github-actions/get-secretmanager-secrets/pull/324)
- Release: v3.0.0 by
[@&#8203;google-github-actions-bot](https://redirect.github.com/google-github-actions-bot)
in
[#&#8203;325](https://redirect.github.com/google-github-actions/get-secretmanager-secrets/pull/325)

**Full Changelog**:
<google-github-actions/get-secretmanager-secrets@v2...v3.0.0>

</details>

---

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♻ **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.

---

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this box

---

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.github/workflows/workflow.yaml

@@ -84,7 +84,7 @@ jobs:
           credentials_json: ${{ secrets.MAINNET_SERVICE_ACCOUNT_KEY }}
       - name: Fetch Secrets
         id: slack-webhook
-        uses: google-github-actions/get-secretmanager-secrets@2b5f97c5a4b9c105e64646762ad4fc3f5128e6f5 # v2.2.5
+        uses: google-github-actions/get-secretmanager-secrets@bc9c54b29fdffb8a47776820a7d26e77b379d262 # v3.0.0
         with:
           # This can point to any slack webhook URL stored in GC Secret Manager
           secrets: |-