fix: resolve mypy no-any-return and pyink formatting errors

Author: vietnamesekid

contributing/samples/gepa/experiment.py

@@ -43,7 +43,6 @@
 from tau_bench.types import EnvRunResult
 from tau_bench.types import RunConfig
 import tau_bench_agent as tau_bench_agent_lib
-
 import utils
 
 

contributing/samples/gepa/run_experiment.py

@@ -25,7 +25,6 @@
 from absl import flags
 import experiment
 from google.genai import types
-
 import utils
 
 _OUTPUT_DIR = flags.DEFINE_string(

src/google/adk/utils/model_name_utils.py

@@ -124,7 +124,7 @@ def is_gemini_2_or_above(model_string: Optional[str]) -> bool:
   except InvalidVersion:
     return False
 
-  return parsed_version.major >= 2
+  return bool(parsed_version.major >= 2)
 
 
 def is_gemini_3_or_above(model_string: Optional[str]) -> bool:
@@ -143,7 +143,7 @@ def is_gemini_3_or_above(model_string: Optional[str]) -> bool:
   if not model_name.startswith('gemini-'):
     return False
 
-  version_string = model_name[len('gemini-'):].split('-', 1)[0]
+  version_string = model_name[len('gemini-') :].split('-', 1)[0]
   if not version_string:
     return False
 
@@ -152,4 +152,4 @@ def is_gemini_3_or_above(model_string: Optional[str]) -> bool:
   except InvalidVersion:
     return False
 
-  return parsed_version.major >= 3
+  return bool(parsed_version.major >= 3)