Update rails requirement from ~> 3.0.0 to ~> 6.1.2

[dependabot-preview]

Updates the requirements on rails to permit the latest version.

Release notes

Sourced from rails's releases.

6.1.2.1

Active Support

• No changes.

Active Model

• No changes.

Active Record

• Fix possible DoS vector in PostgreSQL money type

  Carefully crafted input can cause a DoS via the regular expressions used for validating the money format in the PostgreSQL adapter. This patch fixes the regexp.

  Thanks to @dee-see from Hackerone for this patch!

  [CVE-2021-22880]

  Aaron Patterson

Action View

• No changes.

Action Pack

• Prevent open redirect when allowed host starts with a dot

  [CVE-2021-22881]

  Thanks to @tktech (https://hackerone.com/tktech) for reporting this issue and the patch!

  Aaron Patterson

Active Job

... (truncated)

Commits

• 130c128 Preparing for 6.1.2.1 release
• b5de7b3 Prevent open redirect when allowed host starts with a dot
• 536503d Fix possible DoS vector in PostgreSQL money type
• bf8c59c Preparing for 6.1.2 release
• ca798c0 Merge pull request #41381 from movermeyer/allow_for_nil_addresses_from_dalli_...
• c72e5cc Also don't run guides tests in the benchmark file
• 024522a Fix syntax errors
• b49d55b Don't test the bug report template for main in old Rubies
• 97a0a94 Fix warning with Ruby 2.7 on Time.at with keyword arguments
• 5400804 Merge pull request #41376 from fatkodima/memcached-normalize_key-nil
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #11.