apigw-http-api-lambda-terraform: Update AWS Provider to v6 for Python 3.14

[kakakakakku]

Issue #, if available:
N/A

Description of changes:
Hi😀 Thanks for the useful patterns!

This commit forces the Lambda Python runtime to 3.14, but it seems the update was made without verifying that it actually works.

• 795504a

As a result, I get the following error:

╷
│ Error: expected runtime to be one of [nodejs nodejs4.3 nodejs6.10 nodejs8.10 nodejs10.x nodejs12.x nodejs14.x java8 java8.al2 java11 python2.7 python3.6 python3.7 python3.8 python3.9 dotnetcore1.0 dotnetcore2.0 dotnetcore2.1 dotnetcore3.1 nodejs4.3-edge go1.x ruby2.5 ruby2.7 provided provided.al2], got python3.14
│ 
│   with aws_lambda_function.app,
│   on main.tf line 60, in resource "aws_lambda_function" "app":
│   60:   runtime = "python3.14"
│ 
╵

So I fixed it.

Check

$ curl -s https://bpikmq87k6.execute-api.us-east-1.amazonaws.com | jq .
{
  "message ": {
    "functionName": "test_apigw_integration",
    "xForwardedFor": "124.214.34.83",
    "method": "GET",
    "rawPath": "/",
    "queryString": null,
    "timestamp": "13/Dec/2025:14:07:21 +0000"
  }
}

$ curl -s "https://bpikmq87k6.execute-api.us-east-1.amazonaws.com/pets/dog/1?foo=bar" -X POST | jq .
{
  "message ": {
    "functionName": "test_apigw_integration",
    "xForwardedFor": "124.214.34.83",
    "method": "POST",
    "rawPath": "/pets/dog/1",
    "queryString": {
      "foo": "bar"
    },
    "timestamp": "13/Dec/2025:14:08:59 +0000",
    "body": null
  }
}

Thank you😀

---

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[kakakakakku]

note: Error occurred below. See blog article.

╷
│ Error: creating S3 Bucket (apigw-http-api-lambda20251213135832746300000001) ACL: operation error S3: PutBucketAcl, https response error StatusCode: 400, RequestID: F1PC1FKMGM80WSR6, HostID: rYWFaIU+gyVrqW6b+V+9IvEs17N2n6vjT5EbKq+C6oLMH6bhgyYR5SZuIc2uEYdGO4i7Ynm8jG8=, api error AccessControlListNotSupported: The bucket does not allow ACLs
│ 
│   with aws_s3_bucket_acl.private_bucket,
│   on main.tf line 31, in resource "aws_s3_bucket_acl" "private_bucket":
│   31: resource "aws_s3_bucket_acl" "private_bucket" {
│ 
╵

[kakakakakku]

note: Update AWS Provider to v6 for Python 3.14😀