Remove support for Drupal < 9.1

Talked to rlhawk at Drupalcon about versioning, and its likely a new version is not likely anytime soon due to the downstream dependencies. Thus moving this back.

As of Q2 2025, the minimum version can be safely set to Drupal 9.5 without needing to change the major version.

The patch no longer applied so I fixed it and converted it to an MR.

@ptmkenny, we should update the title, description and MR accordingly to support Drupal core >=10.3 version in 4.x version.

Update ticket to Drop support of Drupal core version below 10.3.

Keeping this intact instead created separate issue for dropping support of Drupal core below 10.3 version.
💬 Drop support of Drupal core below 10.3 version. Active

Thanks for keeping the Drupal 10 and 9 discussion separate. For 8.x-1.x, 9.1 is ok for now. I also updated the format so its easier to parse in drupalci testing. While there used to be benefits of doing the <12 format (to test betas before release) the lenient composer and drupalci issues make core_version_requirement: '^9.1 || ^10 || ^11' a better format now.