Bug: `edrockResponse.is_json` always returns `True` regardless of Content-Type

[T90REAL]

Expected Behaviour

resp_text.is_json() returns False because the content type is not JSON.

Current Behaviour

Both calls return True; is_json ignores content_type.

Code snippet

from aws_lambda_powertools.event_handler.api_gateway import BedrockResponse

resp_json = BedrockResponse(body={"ok": True}, content_type="application/json")
resp_text = BedrockResponse(body="plain", content_type="text/plain")

print(resp_json.is_json())
print(resp_text.is_json())

True
True

Possible Solution

Response.is_json() in the same file correctly looks at the Content-Type. BedrockResponse.is_json() should follow the same logic (checking for application/json or variants) instead of returning True unconditionally.

Steps to Reproduce

Run the repro script.

Powertools for AWS Lambda (Python) version

latest

AWS Lambda function runtime

3.12

Packaging format used

PyPi

Debugging logs