Bump rails from 5.2.3 to 6.0.2.1

[dependabot-preview]

Bumps rails from 5.2.3 to 6.0.2.1.

Release notes

Sourced from rails's releases.

6.0.2.1

Active Support

• No changes.

Active Model

• No changes.

Active Record

• No changes.

Action View

• No changes.

Action Pack

• Fix possible information leak / session hijacking vulnerability.

  The ActionDispatch::Session::MemcacheStore is still vulnerable given it requires the gem dalli to be updated as well.

  CVE-2019-16782.

Active Job

• No changes.

Action Mailer

• No changes.

Action Cable

... (truncated)

Commits

• f33d52c Preparing for 6.0.2.1 release
• ad2da1a Fix possible information leak / session hijacking vulnerability.
• f675cb3 Preparing for 6.0.2 release
• 688e523 Fix release task again
• 63107e9 Preparing for 6.0.2.rc2 release
• ec7721c Revert "Merge pull request #37504 from utilum/no_implicit_conversion_of_nil"
• 296cb7f unlinks Ruby on Rails Tutorial [skip ci]
• 6629ed7 Controller can be symbols as well
• c3135a4 Revert "Merge pull request #37849 from kamipo/fix_since_and_ago"
• fcfe693 Revert "Merge pull request #37839 from ttanimichi/modify-inspect-of-activesup...
• Additional commits viewable in compare view

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[coveralls]

Pull Request Test Coverage Report for Build 2577

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 6 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-1.005%) to 95.31%

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Files with Coverage Reduction	New Missed Lines	%
app/controllers/availabilities_controller.rb	6	87.23%

Totals
Change from base Build 2572:	-1.005%
Covered Lines:	569
Relevant Lines:	597

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💛 - Coveralls

[dependabot-preview]

Superseded by #464.