[Messenger] Fix SQS visibility_timeout type

[valtzu]

Q	A
Branch?	5.4
Bug fix?	yes
New feature?	no
Deprecations?	no
Issues	Introduced in #53524
License	MIT

Getting an error after composer update:

Error thrown while running command "messenger:consume -- async". Message: "HTTP 400 returned for "https://sqs.eu-west-1.amazonaws.com/)".

Code:    SerializationException
Message: STRING_VALUE can not be converted to an Integer
Type:    
Detail:  "

async-aws/sqs v2 is using JSON instead of x-www-form-urlencoded so now all of the sudden, types do matter. If you set visibility_timeout in the DSN, it will be sent as a string to SQS – so we need to cast it explicitly.

[nicolas-grekas]

Thank you @valtzu.