in_http: Fast fix for the issue related to validate the Content-Type

[demonccc]

Fix to accept a Content Type Header that have application/json and other configurations, ex: charset

Fixes #5062

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Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.

[github-actions[bot]]

This PR is stale because it has been open 45 days with no activity. Remove stale label or comment or this will be closed in 10 days.

[rhysjtevans]

When can this be merged? This is causing us problems

[github-actions[bot]]

This PR is stale because it has been open 45 days with no activity. Remove stale label or comment or this will be closed in 10 days.