Bump cachix/install-nix-action from V27 to 29

Bumps [cachix/install-nix-action](https://github.com/cachix/install-nix-action) from V27 to 29. This release includes the previously tagged commit.
- [Release notes](https://github.com/cachix/install-nix-action/releases)
- [Commits](cachix/install-nix-action@V27...v29)

---
updated-dependencies:
- dependency-name: cachix/install-nix-action
  dependency-type: direct:production
...

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

.github/workflows/build_static.yml

@@ -43,7 +43,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Install Nix
-        uses: cachix/install-nix-action@V27
+        uses: cachix/install-nix-action@v29
 
       - name: Enable Cachix
         uses: cachix/cachix-action@v15

.github/workflows/contracts.yml

@@ -25,7 +25,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Install Nix
-        uses: cachix/install-nix-action@V27
+        uses: cachix/install-nix-action@v29
 
       - name: Enable Cachix
         uses: cachix/cachix-action@v15

.github/workflows/test-demo-native-marketplace.yml

@@ -29,7 +29,7 @@ jobs:
         uses: foundry-rs/foundry-toolchain@v1
 
       - name: Install Nix
-        uses: cachix/install-nix-action@V27
+        uses: cachix/install-nix-action@v29
 
       - name: Install process-compose
         run: |

.github/workflows/test-demo-native.yml

@@ -29,7 +29,7 @@ jobs:
         uses: foundry-rs/foundry-toolchain@v1
 
       - name: Install Nix
-        uses: cachix/install-nix-action@V27
+        uses: cachix/install-nix-action@v29
 
       - name: Install process-compose
         run: |

.github/workflows/test.yml

@@ -63,7 +63,7 @@ jobs:
         timeout-minutes: 5
 
       - name: Install Nix
-        uses: cachix/install-nix-action@V27
+        uses: cachix/install-nix-action@v29
 
       - name: Install process-compose
         run: nix profile install nixpkgs#process-compose

.github/workflows/update_nix.yml

@@ -17,7 +17,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Install Nix
-        uses: cachix/install-nix-action@V27
+        uses: cachix/install-nix-action@v29
 
       - uses: cachix/cachix-action@v15
         with: