fix(release): use default versioning strategy for release-please

release-please v17 dropped the 'semver' strategy type — it no longer exists.
'default' is the correct equivalent and produces identical semver behavior.

Fixes: Release Please failing with 'Unknown versioning strategy type: semver'

Author: polaz

release-please-config.json

@@ -10,6 +10,6 @@
       "changelog-path": "CHANGELOG.md"
     }
   },
-  "versioning": "semver",
+  "versioning": "default",
   "initial-version": "0.3.0"
 }