build(deps): Bump the dependencies group (#250)

Bumps the dependencies group in /.github/workflows with 3 updates: [DavidAnson/markdownlint-cli2-action](https://github.com/davidanson/markdownlint-cli2-action), [actions/cache](https://github.com/actions/cache) and [lycheeverse/lychee-action](https://github.com/lycheeverse/lychee-action).


Updates `DavidAnson/markdownlint-cli2-action` from 14.0.0 to 15.0.0
- [Release notes](https://github.com/davidanson/markdownlint-cli2-action/releases)
- [Commits](DavidAnson/markdownlint-cli2-action@v14.0.0...v15.0.0)

Updates `actions/cache` from 3 to 4
- [Release notes](https://github.com/actions/cache/releases)
- [Changelog](https://github.com/actions/cache/blob/main/RELEASES.md)
- [Commits](actions/cache@v3...v4)

Updates `lycheeverse/lychee-action` from 1.9.1 to 1.9.3
- [Release notes](https://github.com/lycheeverse/lychee-action/releases)
- [Commits](lycheeverse/lychee-action@v1.9.1...v1.9.3)

---
updated-dependencies:
- dependency-name: DavidAnson/markdownlint-cli2-action
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: dependencies
- dependency-name: actions/cache
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: dependencies
- dependency-name: lycheeverse/lychee-action
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dependencies
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/docs.yaml

@@ -18,7 +18,7 @@ jobs:
                 uses: "actions/checkout@v4"
 
             -   name: "Check Markdown formatting"
-                uses: "DavidAnson/markdownlint-cli2-action@v14.0.0"
+                uses: "DavidAnson/markdownlint-cli2-action@v15.0.0"
                 with:
                     globs: "*.md|docs/**/*.md"
 
@@ -31,14 +31,14 @@ jobs:
                 uses: "actions/checkout@v4"
 
             -   name: "Restore lychee cache"
-                uses: "actions/cache@v3"
+                uses: "actions/cache@v4"
                 with:
                     path: ".lycheecache"
                     key: "cache-lychee-${{ github.sha }}"
                     restore-keys: cache-lychee-
 
             -   name: "Run Lychee"
-                uses: "lycheeverse/lychee-action@v1.9.1"
+                uses: "lycheeverse/lychee-action@v1.9.3"
                 with:
                     # To keep in sync with Makefile#lychee
                     args: "--verbose --no-progress '*.md' 'docs/**/*.md' --cache --max-cache-age 1d ."