Bump actions/checkout from 4 to 5

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 5.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v5)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/releasing.yml

@@ -16,7 +16,7 @@ jobs:
         timeout-minutes: 10
         steps:
             - name: Checkout 🛎️
-              uses: actions/checkout@v4
+              uses: actions/checkout@v5
             - name: Set up Python 🐍
               uses: actions/setup-python@v5
               with:

.github/workflows/testing.yml

@@ -25,7 +25,7 @@ jobs:
             TORCH_URL: "https://download.pytorch.org/whl/cpu/torch_stable.html"
 
         steps:
-            - uses: actions/checkout@v4
+            - uses: actions/checkout@v5
             - name: Set up Python ${{ matrix.python-version }}
               uses: actions/setup-python@v5
               with: