chore: pin versions

Author: jdc-pub

.config/release-please-config.json

@@ -10,12 +10,15 @@
   "pull-request-footer": "This release was generated with [Release Please](https://github.com/googleapis/release-please).",
   "packages": {
     "crates/git-metadata": {
+      "release-as": "0.3.0-rc.2",
       "prerelease": true
     },
     "crates/git-ledger": {
+      "release-as": "0.1.0-alpha.2",
       "prerelease": true
     },
     "crates/git-chain": {
+      "release-as": "0.1.0-alpha.2",
       "prerelease": true
     }
   },