Remove support for PHP 8.0, add support for PHP 8.3

[glo71317]

Q	A
Documentation	yes/no
Bugfix	yes/no
BC Break	yes/no
New Feature	yes/no
RFC	yes/no
QA	yes/no

Description

[gsteel]

This needs a full revert with the exception of adding 8.3 to the list of compatible PHP versions.

I believe that most of the dependencies here now have 8.3 compatible releases.

If composer still refuses to install dependencies, you can try adding .laminas-ci.json to the root of the project with:

{
     "ignore_php_platform_requirements": {
        "8.3": true
     }
}

[glo71317]

@gsteel Can you suggest about README Linting and Documentation Linting failures?

[gsteel]

The README has trailing spaces and the issue with the docs is the header increment jumps from a level 1 or 2 to a level 4 heading (it should probably be a level 2 or 3 heading depending on context).

See the linting errors in CI: https://github.com/laminas/laminas-http/actions/runs/6707197515

[froschdesign]

@glo71317
Change the headline level from 4:

> #### Known issue with libcurl prior to 7.30.0

to 3:

> ### Known issue with libcurl prior to 7.30.0

laminas-http/docs/book/client/adapters.md

Line 244 in 76de900

> #### Known issue with libcurl prior to 7.30.0

[glo71317]

@gsteel @froschdesign I have fixed linting issues, Can you please review the changes and proceed for merging if there is not an issue?

[gsteel]

Thanks @glo71317

[gsteel]

Would prefer not to bump direct dependencies without a specific reason here.