chore(deps): 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](https://github.com/actions/checkout/compare/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>

.github/workflows/regressions.yml

@@ -16,7 +16,7 @@ jobs:
   multi-peer:
     runs-on: ubicloud-standard-2-ubuntu-2204
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - run: cargo build --bin rosenpass --release
       - run: python misc/generate_configs.py
       - run: chmod +x .ci/run-regression.sh
@@ -27,7 +27,7 @@ jobs:
   boot-race:
     runs-on: ubicloud-standard-2-ubuntu-2204
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - run: cargo build --bin rosenpass --release
       - run: chmod +x .ci/boot_race/run.sh
       - run: cargo run --release --bin rosenpass gen-keys .ci/boot_race/a.toml