Update sqlite3 requirement from ~> 1.4 to ~> 2.0 (#1620)

Updates the requirements on [sqlite3](https://github.com/sparklemotion/sqlite3-ruby) to permit the latest version.
- [Release notes](https://github.com/sparklemotion/sqlite3-ruby/releases)
- [Changelog](https://github.com/sparklemotion/sqlite3-ruby/blob/main/CHANGELOG.md)
- [Commits](sparklemotion/sqlite3-ruby@v1.4.0...v2.0.1)

---
updated-dependencies:
- dependency-name: sqlite3
  dependency-type: direct:development
...

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Author: dependabot[bot]

devise_token_auth.gemspec

@@ -27,7 +27,7 @@ Gem::Specification.new do |s|
   s.add_dependency 'bcrypt', '~> 3.0'
 
   s.add_development_dependency 'appraisal'
-  s.add_development_dependency 'sqlite3', '~> 1.4'
+  s.add_development_dependency 'sqlite3', '~> 2.0'
   s.add_development_dependency 'pg'
   s.add_development_dependency 'mysql2'
   s.add_development_dependency 'mongoid', '>= 4', '< 8'