Add bedrock_service_tier setting to BedrockModelSettings

[lukekh]

also updated the version for boto3-stubs[bedrock-runtime] so that it included ServiceTierTypeDef

Closes #3761

---

Note

Adds Bedrock service tier support

• New BedrockModelSettings.bedrock_service_tier (typed as ServiceTierTypeDef) and propagation to request param serviceTier in bedrock.py
• Imports ServiceTierTypeDef; request builder now includes serviceTier when provided
• New test test_bedrock_model_service_tier with VCR cassette
• Dependency bumps to include required typings: boto3>=1.42.14 for bedrock extra and boto3-stubs[bedrock-runtime]>=1.42.13 in dev/lockfiles

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[DouweM]

@lukekh coverage requests that you add a test that uses the new setting :)

[lukekh]

@lukekh coverage requests that you add a test that uses the new setting :)

Hopefully satisfactory now. I was getting an error until I added boto3 to the dev dependencies... Should I have instead updated the boto3 dependency here?

[DouweM]

@lukekh Yes please update it for the optional dependency group; we shouldn't need to list it explicitly under dev

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[cursor]

Test cassette request mismatches test code service tier value

The test specifies bedrock_service_tier={'type': 'flex'} but the cassette file shows "serviceTier": {"type": "default"} in the recorded request body. This mismatch means the test isn't validating what it claims to test. The cassette appears to have been recorded with a different value than what the test code now uses, making the test unreliable for catching regressions in the bedrock_service_tier functionality.

Additional Locations (1)

• tests/models/test_bedrock.py#L566-L567