chore(release): remove stale release-as pins for marketplaces (#989)

Author: tmchow

.github/release-please-config.json

@@ -78,7 +78,6 @@
     ".claude-plugin": {
       "release-type": "simple",
       "package-name": "marketplace",
-      "release-as": "1.0.3",
       "extra-files": [
         {
           "type": "json",
@@ -90,7 +89,6 @@
     ".cursor-plugin": {
       "release-type": "simple",
       "package-name": "cursor-marketplace",
-      "release-as": "1.0.2",
       "extra-files": [
         {
           "type": "json",