Revert "release: increase timeout for creating lambda from 3s to 10s"

This reverts commit 98987a64c3.

The timeout option doesn't have any effect, since the error happens in a
later function call to PublishVersion.

_releaser/aws.go

@@ -129,7 +129,6 @@ func (s *AwsCloudfrontUpdateCmd) Run() error {
 		}
 		_, err = svc.CreateFunction(&lambda.CreateFunctionInput{
 			FunctionName: aws.String(s.Function),
-			Timeout:      aws.Int64(10),
 		})
 		if aerr, ok := err.(awserr.Error); ok && aerr.Code() != lambda.ErrCodeResourceConflictException {
 			return err