chore(deps): bump cachix/install-nix-action from 26 to 27

Bumps [cachix/install-nix-action](https://github.com/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)

---
updated-dependencies:
- dependency-name: cachix/install-nix-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/nix-portable.yml

@@ -24,7 +24,7 @@ jobs:
           # Nix Flakes doesn't work on shallow clones
           fetch-depth: 0
 
-    - uses: cachix/install-nix-action@v26
+    - uses: cachix/install-nix-action@V27
       with:
         extra_nix_config: |
           experimental-features = nix-command flakes
@@ -72,7 +72,7 @@ jobs:
           # Nix Flakes doesn't work on shallow clones
           fetch-depth: 0
 
-    - uses: cachix/install-nix-action@v26
+    - uses: cachix/install-nix-action@V27
       with:
         extra_nix_config: |
           experimental-features = nix-command flakes
@@ -113,7 +113,7 @@ jobs:
   #         # Nix Flakes doesn't work on shallow clones
   #         fetch-depth: 0
 
-  #   - uses: cachix/install-nix-action@v26
+  #   - uses: cachix/install-nix-action@V27
   #     with:
   #       extra_nix_config: |
   #         experimental-features = nix-command flakes
@@ -139,7 +139,7 @@ jobs:
           # Nix Flakes doesn't work on shallow clones
           fetch-depth: 0
 
-    - uses: cachix/install-nix-action@v26
+    - uses: cachix/install-nix-action@V27
       with:
         extra_nix_config: |
           experimental-features = nix-command flakes
@@ -164,7 +164,7 @@ jobs:
           # Nix Flakes doesn't work on shallow clones
           fetch-depth: 0
 
-    - uses: cachix/install-nix-action@v26
+    - uses: cachix/install-nix-action@V27
       with:
         extra_nix_config: |
           experimental-features = nix-command flakes

.github/workflows/update-flake-lock.yml

@@ -11,7 +11,7 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
       - name: Install Nix
-        uses: cachix/install-nix-action@v26
+        uses: cachix/install-nix-action@V27
       # `bors merge` will automerge if tests succeed
       # Requires this github to be installed: https://app.bors.tech/
       - name: Update flake.lock