chore: update phpstan version and remove phpstan-baseline

This commit updates the version of phpstan specified in .phive/phars.xml file to 1.* and the current installed version to 1.12.13.

Additionally, it removes all the previously ignored errors in phpstan-baseline.neon. The actions were taken possibly due to fixes to these errors or related update in the codebase causing them to be obsolete.

Please ensure related checks/errors do not surface again due to the removed baseline ignores.

merged

mentioned in commit 12da4391

This MR is included in version 3.2.2

The release is available on GitLab release.

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