Update the minimum supported version of Ruby from 2.7.x to 3.0.x

[jcouball]

Update the minimum supported version of Ruby from 2.7.x to 3.0.x

In order to do this, the following changes were made:

• Update minimum supported Ruby version from 2.7.x to 3.0.x
• Update dependencies to latest versions
• Remove solargraph as a development dependency as it doesn't build on all platforms
• Update Rubocop configuration based on new cops
• Update rspec configuration to be consistent with other projects in the main-branch Github org
• Remove bump from the project replacing it with semverify
• Document how to make a new release using create-github-release

[codeclimate]

Code Climate has analyzed commit e7bb7d7 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 100.0% (0.0% change).

View more on Code Climate.

[jcouball]

The changes in this PR were added in several other PRs:

• Enforce that a semver label is present on PRs #28
• Instruct Rubocop that dev deps go in gemspec #29
• Update all development dependencies to latest versions #30
• Update spec_helper.rb to new standard #31
• Update the minimum required Ruby version from 2.7 to 3.0 #32