v3.1.0

Add default gems removed in Ruby 3.4

Drop Rails 6.1 from CI since it's EOL

Fix sqlite appraisals

Update appraisals

Move simple_calendar.scss to simple_calendar.css (#356)

Bump rexml from 3.2.8 to 3.3.6 (#347)

Bump puma from 6.4.2 to 6.4.3 (#348)

Bump actiontext from 7.1.3.2 to 7.1.3.4 (#343)

Add changelog_uri to gemspec (#345)

Bump rexml from 3.2.6 to 3.2.8 (#341)

Bump nokogiri from 1.16.3 to 1.16.5 (#340)

Version bump

Push now

Add lib file in commit