chore: set release-please manifest to 1.0.0

1.0.0 was cut manually; tell release-please so future runs propose 1.0.1+
instead of re-proposing 1.0.0.

Author: brovatten

.release-please-manifest.json

@@ -1,3 +1,3 @@
 {
-  ".": "0.1.2"
+  ".": "1.0.0"
 }