chore(deps): Bump DeterminateSystems/determinate-nix-action

Bumps [DeterminateSystems/determinate-nix-action](https://github.com/determinatesystems/determinate-nix-action) from 3.19.0 to 3.20.0.
- [Release notes](https://github.com/determinatesystems/determinate-nix-action/releases)
- [Commits](DeterminateSystems/determinate-nix-action@v3.19.0...v3.20.0)

---
updated-dependencies:
- dependency-name: DeterminateSystems/determinate-nix-action
  dependency-version: 3.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

.github/workflows/validate-build.yml

@@ -12,7 +12,7 @@ jobs:
       - name: Check Nix flake inputs
         uses: DeterminateSystems/flake-checker-action@v12
       - name: Install Nix
-        uses: DeterminateSystems/determinate-nix-action@v3.19.0
+        uses: DeterminateSystems/determinate-nix-action@v3.20.0
       - name: Build default package
         run: nix build
       - name: Run

.github/workflows/validate-tag.yml

@@ -13,7 +13,7 @@ jobs:
       - name: Check Nix flake inputs
         uses: DeterminateSystems/flake-checker-action@v12
       - name: Install Nix
-        uses: DeterminateSystems/determinate-nix-action@v3.19.0
+        uses: DeterminateSystems/determinate-nix-action@v3.20.0
       - name: Build default package
         run: nix build
       - name: Run