chore: pin next release

Author: jdc-pub

.config/release-please-config.json

@@ -9,7 +9,9 @@
   "draft-pull-request": true,
   "pull-request-footer": "This release was generated with [Release Please](https://github.com/googleapis/release-please).",
   "packages": {
-    "crates/git-metadata": {}
+    "crates/git-metadata": {
+      "release-as": "0.2.1"
+    }
   },
   "plugins": [{ "type": "sentence-case" }, { "type": "cargo-workspace" }],
   "$schema": "https://raw.githubusercontent.com/googleapis/release-please/main/schemas/config.json"