build(deps): bump cachix/cachix-action from v9 to v10 (#105)

Bumps [cachix/cachix-action](https://github.com/cachix/cachix-action) from v9 to v10.
- [Release notes](https://github.com/cachix/cachix-action/releases)
- [Commits](cachix/cachix-action@v9...73e75d1)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/nix.yml

@@ -16,7 +16,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - uses: cachix/install-nix-action@v13
-      - uses: cachix/cachix-action@v9
+      - uses: cachix/cachix-action@v10
         with:
           name: numtide
           signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
@@ -29,7 +29,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - uses: cachix/install-nix-action@v13
-      - uses: cachix/cachix-action@v9
+      - uses: cachix/cachix-action@v10
         with:
           name: numtide
           signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'