apigw-http-eventbridge-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 nodejs16.x java8 java8.al2 java11 python2.7 python3.6 python3.7 python3.8 python3.9 dotnetcore1.0 dotnetcore2.0 dotnetcore2.1 dotnetcore3.1 dotnet6 nodejs4.3-edge go1.x ruby2.5 ruby2.7 provided provided.al2 nodejs18.x], got python3.14
│ 
│   with aws_lambda_function.MyLambdaFunction,
│   on main.tf line 185, in resource "aws_lambda_function" "MyLambdaFunction":
│  185:   runtime          = "python3.14"
│ 
╵

So I fixed it.

Check

$ curl --location --request POST 'https://flr7isxlm2.execute-api.us-east-1.amazonaws.com/' --header 'Content-Type: application/json' \
--data-raw '{
    "Detail":{
        "message": "Hello From API Gateway"
    }
}'
{"Entries":[{"EventId":"a8a57abc-2f8d-7bcb-b0e7-d0ffb98b1d86"}],"FailedEntryCount":0}

Thank you😀

---

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[kakakakakku]

note: https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/region

name - (Optional, Deprecated) Full name of the region to select. Use region instead.

╷
│ Warning: Deprecated attribute
│ 
│   on main.tf line 57, in resource "aws_iam_policy" "APIGWPolicy":
│   57:       "Resource" : "arn:aws:events:${data.aws_region.current.name}:${data.aws_caller_identity.current.account_id}:event-bus/default"
│ 
│ The attribute "name" is deprecated. Refer to the provider documentation for details.
│ 
│ (and 2 more similar warnings elsewhere)

[kakakakakku]

note: Update AWS Provider to v6 for Python 3.14😀