Bump the actions group with 2 updates

Bumps the actions group with 2 updates: [taiki-e/install-action](https://github.com/taiki-e/install-action) and [cachix/install-nix-action](https://github.com/cachix/install-nix-action).


Updates `taiki-e/install-action` from 2.68.34 to 2.69.7
- [Release notes](https://github.com/taiki-e/install-action/releases)
- [Changelog](https://github.com/taiki-e/install-action/blob/main/CHANGELOG.md)
- [Commits](de6bbd1333...0d865d5cc6)

Updates `cachix/install-nix-action` from 31.10.1 to 31.10.2
- [Release notes](https://github.com/cachix/install-nix-action/releases)
- [Changelog](https://github.com/cachix/install-nix-action/blob/master/RELEASE.md)
- [Commits](1ca7d21a94...51f3067b56)

---
updated-dependencies:
- dependency-name: taiki-e/install-action
  dependency-version: 2.69.7
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: actions
- dependency-name: cachix/install-nix-action
  dependency-version: 31.10.2
  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@0d865d5cc6d507df4765f1f866bfae8bab4e2a73 # v2.69.7
         with:
           tool: cargo-llvm-cov
 

.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@51f3067b56fe8ae331890c77d4e454f6d60615ff # v31.10.2
 
       - uses: ./
         with: