fix(flagd-api-testkit): fix release-please version (#1751)

Signed-off-by: Simon Schrottner <simon.schrottner@dynatrace.com>

Author: aepfli

.release-please-manifest.json

@@ -14,6 +14,7 @@
   "tools/junit-openfeature": "0.2.1",
   "tools/flagd-http-connector": "0.0.4",
   "tools/flagd-api": "0.1.0",
+  "tools/flagd-api-testkit": "0.1.0",
   "tools/flagd-core": "0.1.0",
   ".": "1.0.0"
 }