chore(deps): update actions/checkout action to v5 (#17)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/checkout](https://redirect.github.com/actions/checkout) |
action | major | `v4` -> `v5` |

---

### Release Notes

<details>
<summary>actions/checkout (actions/checkout)</summary>

### [`v5`](https://redirect.github.com/actions/checkout/compare/v4...v5)

[Compare
Source](https://redirect.github.com/actions/checkout/compare/v4...v5)

</details>

---

### Configuration

📅 **Schedule**: Branch creation - Only on Sunday and Saturday ( * * * *
0,6 ) in timezone Europe/Paris, 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

---

This PR was created by Renovate.

<details>
<summary>Details</summary>

Check the [default
configuration](https://redirect.github.com/doctolib/renovate-config) and
[documentation](https://doctolib.atlassian.net/wiki/spaces/EE/pages/1882882081/Renovate+Dependencies+Management).

See the [logs on
Datadog](https://app.datadoghq.com/logs?query=source%3Agithub%20%40git.repository_url%3A%22https%3A%2F%2Fgithub.com%2Fdoctolib%2Frenovate-config.git%22%20%40ci.pipeline.name%3A%28Run%5C%20Renovate%5C%20%5C%28%2A%20OR%20%22Run%20Renovate%20on%20doctolib%2Fdoctolib%22%29%20%40name%3Arenovate%20%40repository%3A%2A%2A%2A%2Fpg_no_seqscan&agg_m=count&agg_m_source=base&agg_t=count&cols=%40repository&fromUser=false&messageDisplay=inline&refresh_mode=sliding&storage=hot&stream_sort=time%2Cdesc&viz=stream).
To replay this update, you can use the following `packageRules` on the
[Manual
Run](https://redirect.github.com/doctolib/renovate-config/actions/workflows/manual_run.yml)
page: `[{"matchPackageNames": ["*"], "enabled": false},
{"matchPackageNames": ["actions/checkout"], "enabled": true}]`

</details>

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0MS43NC4yIiwidXBkYXRlZEluVmVyIjoiNDEuNzQuMiIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOlsiYXV0by1hcHByb3ZlIiwiZGVwZW5kZW5jaWVzIiwiZ2l0aHViLWFjdGlvbnMiLCJtYWpvciIsIm1ham9yIl19-->

Co-authored-by: doctolib-renovate[bot] <161009298+doctolib-renovate[bot]@users.noreply.github.com>

Author: doctolib-renovate[bot]

.github/workflows/ci_pr_tests.yml

@@ -23,7 +23,7 @@ jobs:
       - name: Start - PG ${{ matrix.pg }}
         run: pg-start ${{ matrix.pg }}
       - name: Check out the repo - PG ${{ matrix.pg }}
-        uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
       - name: 🧪 Test - PG ${{ matrix.pg }}
         run: pgrx-build-test
       - name: 📎 Clippy - PG ${{ matrix.pg }}
@@ -34,6 +34,6 @@ jobs:
     runs-on: ubuntu-latest
     container: pgxn/pgxn-tools
     steps:
-      - uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
       - name: 📖 Check format
         run: cargo --color always fmt --all -- --check