Update jest monorepo (major)

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@types/jest	25.2.3 -> 27.5.1
jest (source)	25.5.4 -> 28.1.0
ts-jest (source)	25.5.1 -> 28.0.2

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[codecov]

Codecov Report

Merging #391 (5a31999) into master (3f0a633) will increase coverage by 0.76%.
The diff coverage is n/a.

❗ Current head 5a31999 differs from pull request most recent head 9a62f73. Consider uploading reports for the commit 9a62f73 to get more accurate results

@@            Coverage Diff             @@
##           master     #391      +/-   ##
==========================================
+ Coverage   73.82%   74.58%   +0.76%     
==========================================
  Files          19       19              
  Lines         657      657              
  Branches      115      115              
==========================================
+ Hits          485      490       +5     
- Misses        144      151       +7     
+ Partials       28       16      -12     

Impacted Files	Coverage Δ
server/src/util/fs.ts	75.00% <0.00%> (ø)
server/src/util/sh.ts	88.46% <0.00%> (ø)
server/src/executables.ts	93.75% <0.00%> (ø)
server/src/server.ts	58.20% <0.00%> (+1.05%)	⬆️
server/src/analyser.ts	83.62% <0.00%> (+1.16%)	⬆️
server/src/linter.ts	89.85% <0.00%> (+1.44%)	⬆️

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