Bump the actions group across 1 directory with 3 updates

Bumps the actions group with 3 updates in the / directory: [taiki-e/install-action](https://github.com/taiki-e/install-action), [dependabot/fetch-metadata](https://github.com/dependabot/fetch-metadata) and [cachix/install-nix-action](https://github.com/cachix/install-nix-action).


Updates `taiki-e/install-action` from 2.68.34 to 2.70.2
- [Release notes](https://github.com/taiki-e/install-action/releases)
- [Changelog](https://github.com/taiki-e/install-action/blob/main/CHANGELOG.md)
- [Commits](de6bbd1333...e9e8e031bc)

Updates `dependabot/fetch-metadata` from 2.5.0 to 3.0.0
- [Release notes](https://github.com/dependabot/fetch-metadata/releases)
- [Commits](21025c705c...ffa630c65f)

Updates `cachix/install-nix-action` from 31.10.1 to 31.10.3
- [Release notes](https://github.com/cachix/install-nix-action/releases)
- [Changelog](https://github.com/cachix/install-nix-action/blob/master/RELEASE.md)
- [Commits](1ca7d21a94...96951a368b)

---
updated-dependencies:
- dependency-name: taiki-e/install-action
  dependency-version: 2.70.2
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: actions
- dependency-name: dependabot/fetch-metadata
  dependency-version: 3.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
- dependency-name: cachix/install-nix-action
  dependency-version: 31.10.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: actions
...

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

.github/workflows/coverage.yml

@@ -25,7 +25,7 @@ jobs:
 
       - run: rustup toolchain install stable --profile minimal --component llvm-tools-preview --no-self-update
 
-      - uses: taiki-e/install-action@de6bbd1333b8f331563d54a051e542c7dfef81c3 # v2.68.34
+      - uses: taiki-e/install-action@e9e8e031bcd90cdbe8ac6bb1d376f8596e587fbf # v2.70.2
         with:
           tool: cargo-llvm-cov
 

.github/workflows/dependabot.yml

@@ -15,7 +15,7 @@ jobs:
     steps:
       - name: Fetch metadata
         id: metadata
-        uses: dependabot/fetch-metadata@21025c705c08248db411dc16f3619e6b5f9ea21a # v2.5.0
+        uses: dependabot/fetch-metadata@ffa630c65fa7e0ecfa0625b5ceda64399aea1b36 # v3.0.0
         with:
           github-token: "${{ secrets.GITHUB_TOKEN }}"
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2

.github/workflows/nix.yml

@@ -20,7 +20,7 @@ jobs:
         with:
           persist-credentials: false
 
-      - uses: cachix/install-nix-action@1ca7d21a94afc7c957383a2d217460d980de4934 # v31.10.1
+      - uses: cachix/install-nix-action@96951a368ba55167b55f1c916f7d416bac6505fe # v31.10.3
 
       - uses: ./
         with: