chore(devDeps): upgrade eslint packages

[JKRhb]

In the context of #1097, I noticed that eslint currently reports a couple of false positives when it comes to typing. Furthermore, when running npm run lint, it warns of missing compatibility with the currently used TypeScript version.

This PR simply updates all of the eslint-related packages and applies some (partially automated) fixes to the codebase.

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (49ad831) 75.52% compared to head (195c82b) 75.52%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1103   +/-   ##
=======================================
  Coverage   75.52%   75.52%           
=======================================
  Files          80       80           
  Lines       16153    16153           
  Branches     1520     1520           
=======================================
  Hits        12200    12200           
  Misses       3914     3914           
  Partials       39       39           

Files	Coverage Δ
packages/binding-coap/src/coap-client.ts	82.28% <100.00%> (ø)
packages/binding-http/src/http-client-impl.ts	66.58% <100.00%> (ø)
packages/binding-http/src/oauth-manager.ts	98.26% <100.00%> (ø)
packages/core/src/consumed-thing.ts	83.37% <100.00%> (ø)
packages/core/src/helpers.ts	83.00% <100.00%> (ø)
packages/td-tools/src/thing-model-helpers.ts	84.41% <100.00%> (ø)
packages/binding-http/src/credential.ts	80.93% <0.00%> (ø)
...s/td-tools/src/util/asset-interface-description.ts	81.88% <50.00%> (ø)

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[relu91]

Thanks this was very well needed.