Upgrade Rails 6.1

[huacnlee]

No description provided.

[codecov]

Codecov Report

Merging #142 (ecf535c) into master (44f9b47) will decrease coverage by 92.14%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #142       +/-   ##
==========================================
- Coverage   92.57%   0.43%   -92.15%     
==========================================
  Files         273     271        -2     
  Lines        4605    6470     +1865     
==========================================
- Hits         4263      28     -4235     
- Misses        342    6442     +6100     

Impacted Files	Coverage Δ
app/controllers/blobs_controller.rb	0.00% <0.00%> (-60.61%)	⬇️
app/controllers/dashboards_controller.rb	0.00% <0.00%> (-96.30%)	⬇️
app/controllers/docs_controller.rb	0.00% <0.00%> (-97.20%)	⬇️
app/controllers/notes_controller.rb	0.00% <ø> (-98.69%)	⬇️
app/controllers/notifications_controller.rb	0.00% <0.00%> (-100.00%)	⬇️
app/helpers/repositories_helper.rb	0.00% <0.00%> (-100.00%)	⬇️
app/jobs/repository_import_job.rb	0.00% <0.00%> (-76.48%)	⬇️
app/models/activity.rb	0.00% <0.00%> (-100.00%)	⬇️
app/models/application_record.rb	0.00% <0.00%> (-100.00%)	⬇️
app/models/doc.rb	0.00% <0.00%> (-95.84%)	⬇️
... and 294 more

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