Bump prefix-dev/rattler-build-action from 0.2.18 to 0.2.21

Bumps [prefix-dev/rattler-build-action](https://github.com/prefix-dev/rattler-build-action) from 0.2.18 to 0.2.21.
- [Release notes](https://github.com/prefix-dev/rattler-build-action/releases)
- [Commits](prefix-dev/rattler-build-action@v0.2.18...v0.2.21)

---
updated-dependencies:
- dependency-name: prefix-dev/rattler-build-action
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

.github/workflows/publish.yml

@@ -118,7 +118,7 @@ jobs:
       - name: Create channel
         run: mkdir -p /tmp/ecoscope/release/artifacts
       - name: Build prefix release
-        uses: prefix-dev/[email protected].18
+        uses: prefix-dev/[email protected].21
         with:
           recipe-path: publish/recipes/release/ecoscope.yaml
           build-args: --output-dir /tmp/ecoscope/release/artifacts --channel https://prefix.dev/ecoscope-workflows --channel conda-forge