build(deps): bump DeterminateSystems/magic-nix-cache-action from 6 to 7

Bumps [DeterminateSystems/magic-nix-cache-action](https://github.com/determinatesystems/magic-nix-cache-action) from 6 to 7.
- [Release notes](https://github.com/determinatesystems/magic-nix-cache-action/releases)
- [Commits](DeterminateSystems/magic-nix-cache-action@v6...v7)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/main.yaml

@@ -11,7 +11,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: DeterminateSystems/nix-installer-action@v11
-      - uses: DeterminateSystems/magic-nix-cache-action@v6
+      - uses: DeterminateSystems/magic-nix-cache-action@v7
       - uses: cachix/cachix-action@v15
         with:
           name: nialov
@@ -31,7 +31,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: DeterminateSystems/nix-installer-action@v11
-      - uses: DeterminateSystems/magic-nix-cache-action@v6
+      - uses: DeterminateSystems/magic-nix-cache-action@v7
       - uses: cachix/cachix-action@v15
         with:
           name: nialov
@@ -46,7 +46,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: DeterminateSystems/nix-installer-action@v11
-      - uses: DeterminateSystems/magic-nix-cache-action@v6
+      - uses: DeterminateSystems/magic-nix-cache-action@v7
       - uses: cachix/cachix-action@v15
         with:
           name: nialov
@@ -112,7 +112,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: DeterminateSystems/nix-installer-action@v11
-      - uses: DeterminateSystems/magic-nix-cache-action@v6
+      - uses: DeterminateSystems/magic-nix-cache-action@v7
       - uses: cachix/cachix-action@v15
         with:
           name: nialov