Bump DeterminateSystems/determinate-nix-action from 3 to 3.21.5 in the minor group (#1735)

Bump DeterminateSystems/determinate-nix-action in the minor group

Bumps the minor group with 1 update: [DeterminateSystems/determinate-nix-action](https://github.com/determinatesystems/determinate-nix-action).


Updates `DeterminateSystems/determinate-nix-action` from 3 to 3.21.5
- [Release notes](https://github.com/determinatesystems/determinate-nix-action/releases)
- [Commits](DeterminateSystems/determinate-nix-action@v3...v3.21.5)

---
updated-dependencies:
- dependency-name: DeterminateSystems/determinate-nix-action
  dependency-version: 3.21.5
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: minor
...

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

Author: dependabot[bot]

.github/workflows/flakehub.yml

@@ -13,7 +13,7 @@ jobs:
       - uses: "actions/checkout@v7.0.0"
         with:
           persist-credentials: false
-      - uses: "DeterminateSystems/determinate-nix-action@v3.21.2"
+      - uses: "DeterminateSystems/determinate-nix-action@v3.21.5"
       - uses: "DeterminateSystems/flakehub-push@main"
         with:
           name: "Zoo/cli"

.github/workflows/nix.yml

@@ -65,7 +65,7 @@ jobs:
           submodules: recursive
           ref: ${{ github.head_ref }}
 
-      - uses: DeterminateSystems/determinate-nix-action@v3
+      - uses: DeterminateSystems/determinate-nix-action@v3.21.5
 
       - name: Build and collect hash mismatches
         id: nix_build