chore: bump version to 0.3.8

Fix release workflow immutability issues.

Release includes:
- Drawer opacity fix for namespace detail view (#12)
- Plugin display name change to 'polaris' (#9)
- Repository metadata in package.json (#11)
- E2E tests using on-prem k3s-animaniacs runners (#10)

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Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "polaris",
-  "version": "0.3.7",
+  "version": "0.3.8",
   "description": "Headlamp plugin for Fairwinds Polaris audit results",
   "repository": {
     "type": "git",