ci: Fix GHA issues during preparation

[ribose-jeffreylau]

See: https://stackoverflow.com/questions/48517262/error-installing-mongodb-broken-ubuntu-dependency

[codecov]

Codecov Report

Merging #97 into master will increase coverage by 35.45%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master      #97       +/-   ##
===========================================
+ Coverage   64.00%   99.45%   +35.45%     
===========================================
  Files          26       24        -2     
  Lines         589      369      -220     
===========================================
- Hits          377      367       -10     
+ Misses        212        2      -210     

Impacted Files	Coverage Δ
lib/attr_masker/attribute.rb	100.00% <ø> (ø)
lib/attr_masker/maskers/replacing.rb	100.00% <ø> (ø)
lib/attr_masker/maskers/simple.rb	100.00% <ø> (ø)
spec/spec_helper.rb
spec/features/shared_examples.rb

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[ronaldtse]

@ribose-jeffreylau there is some issue with the gem spec versions:

Bundler could not find compatible versions for gem "activerecord":
18
  In Rails-4.2.gemfile:
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    activerecord (~> 4.2.0)
20

21
    attr_masker was resolved to 0.2.1, which depends on
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      rails (>= 4.0.0, < 7) was resolved to 5.0.5.rc1, which depends on
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        activerecord (= 5.0.5.rc1)
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[ronaldtse]

I'm going to merge this for now and mark a new bug for Rails 4.2 with Ruby 2.4, 2.5 and 2.6.