Revert localstack to dev/test extras in utils

Moving localstack to runtime deps broke the utils CI venv setup.
Revert to keeping it in dev/test extras where it was before — the
paradedb CI issue is unrelated to this.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: whummer

utils/pyproject.toml

@@ -18,7 +18,6 @@ dependencies = [
     "hpack",
     "httpx",
     "hyperframe",
-    "localstack",
     "priority",
     "requests",
     "rolo",
@@ -33,13 +32,15 @@ dev = [
     "boto3",
     "build",
     "jsonpatch",
+    "localstack",
     "pytest",
     "ruff",
 ]
 test = [
     "grpcio>=1.60.0",
     "grpcio-tools>=1.60.0",
     "jsonpatch",
+    "localstack",
     "pytest>=7.0",
     "pytest-timeout>=2.0",
 ]