Bump boto3 lower bound to >=1.41.2 to match botocore floor

[laughingman7743]

WHAT

Bump the boto3 lower bound from >=1.38.2 to >=1.41.2 to match the existing botocore>=1.41.2 floor.

-    "boto3>=1.38.2",
+    "boto3>=1.41.2",
     "botocore>=1.41.2",

uv.lock is regenerated; only the specifier metadata changes (resolved versions were already boto3/botocore 1.43.14).

WHY

boto3 1.38.2 declares botocore<1.39.0,>=1.38.2, which has an empty intersection with the current botocore>=1.41.2 floor (raised in #708 for DpuCount). As a result, boto3>=1.38.2 was never actually satisfiable together with the botocore floor — pip already resolves boto3 up to >=1.41.2 in practice, so the declared 1.38.2 floor was misleading.

botocore/boto3 ship in lockstep (matching version numbers), so the boto3 floor should track the botocore floor. boto3 1.41.2 requires botocore<1.42.0,>=1.41.2, which aligns with the existing constraint.

This is a follow-up to #708 / #709 (Managed Query Results): the managed-query-result workgroup APIs landed in botocore 1.38.28 and are already covered by the 1.41.2 floor, so no further bump is needed beyond making the boto3 floor consistent.