build(deps): bump DeterminateSystems/update-flake-lock

Bumps [DeterminateSystems/update-flake-lock](https://github.com/determinatesystems/update-flake-lock) from ff43f160ef7014ae1a1fd85699fb6a44f436135b to 203e2eb079eca40abff70ea3189192e9adeca500.
- [Release notes](https://github.com/determinatesystems/update-flake-lock/releases)
- [Commits](DeterminateSystems/update-flake-lock@ff43f16...203e2eb)

---
updated-dependencies:
- dependency-name: DeterminateSystems/update-flake-lock
  dependency-version: 203e2eb079eca40abff70ea3189192e9adeca500
  dependency-type: direct:production
...

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

Author: dependabot[bot]

.github/workflows/update.yaml

@@ -16,7 +16,7 @@ jobs:
     steps:
       - uses: actions/checkout@v6
       - uses: DeterminateSystems/determinate-nix-action@v3.19.0
-      - uses: DeterminateSystems/update-flake-lock@ff43f160ef7014ae1a1fd85699fb6a44f436135b
+      - uses: DeterminateSystems/update-flake-lock@203e2eb079eca40abff70ea3189192e9adeca500
         with:
           pr-title: Update Nix flake inputs
           sign-commits: true