Bump the github-actions group across 1 directory with 2 updates

Bumps the github-actions group with 2 updates in the / directory: [cachix/install-nix-action](https://github.com/cachix/install-nix-action) and [DeterminateSystems/magic-nix-cache-action](https://github.com/determinatesystems/magic-nix-cache-action).


Updates `cachix/install-nix-action` from 26 to 27
- [Release notes](https://github.com/cachix/install-nix-action/releases)
- [Commits](cachix/install-nix-action@v26...V27)

Updates `DeterminateSystems/magic-nix-cache-action` from 3 to 6
- [Release notes](https://github.com/determinatesystems/magic-nix-cache-action/releases)
- [Commits](DeterminateSystems/magic-nix-cache-action@v3...v6)

---
updated-dependencies:
- dependency-name: cachix/install-nix-action
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
- dependency-name: DeterminateSystems/magic-nix-cache-action
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
...

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

.github/workflows/auto_update_sri_pr.yml

@@ -37,8 +37,8 @@ jobs:
         with:
           token: ${{secrets.REPO_CONTENT_UPDATE_TOKEN}}
           fetch-depth: 0 # otherwise, you will failed to push refs to dest repo
-      - uses: cachix/install-nix-action@v26
-      - uses: DeterminateSystems/magic-nix-cache-action@v3
+      - uses: cachix/install-nix-action@V27
+      - uses: DeterminateSystems/magic-nix-cache-action@v6
       - name: re-generate SRI
         run: "nix --extra-experimental-features nix-command --extra-experimental-features flakes run .#regenSRI"
 

.github/workflows/docker-publish.yml

@@ -31,8 +31,8 @@ jobs:
       id-token: write
 
     steps:
-      - uses: cachix/install-nix-action@v26
-      - uses: DeterminateSystems/magic-nix-cache-action@v3
+      - uses: cachix/install-nix-action@V27
+      - uses: DeterminateSystems/magic-nix-cache-action@v6
       - name: Checkout repository
         uses: actions/checkout@v4
 

.github/workflows/nix_update.yml

@@ -12,7 +12,7 @@ jobs:
       pull-requests: write
     steps:
       - uses: actions/checkout@v4.1.2
-      - uses: cachix/install-nix-action@v26
+      - uses: cachix/install-nix-action@V27
       - uses: fregante/setup-git-user@v2
       - run: nix flake update --commit-lock-file
       - run: nix flake check .