build(deps): bump divan from 0.1.18 to 0.1.21 (#3621)

Bumps [divan](https://github.com/nvzqz/divan) from 0.1.18 to 0.1.21.
- [Changelog](https://github.com/nvzqz/divan/blob/main/CHANGELOG.md)
- [Commits](https://github.com/nvzqz/divan/compare/v0.1.18...v0.1.21)

---
updated-dependencies:
- dependency-name: divan
  dependency-version: 0.1.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

.github/dependabot.yml

@@ -1,10 +1,11 @@
 version: 2
 updates:
-  - package-ecosystem: cargo
-    directory: /
-    schedule:
-      interval: weekly
   - package-ecosystem: github-actions
     directory: /
     schedule:
       interval: weekly
+  - package-ecosystem: cargo
+    directory: /
+    schedule:
+      interval: weekly
+    versioning-strategy: lockfile-only