Fix dependabot config and set default reviewer

[Siemienik]

No description provided.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[codecov]

Codecov Report

Merging #200 (3aa43f2) into master (497e186) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #200   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           55        55           
  Lines         1087      1087           
  Branches       154       154           
=========================================
  Hits          1087      1087           

Flag	Coverage Δ
xlsx-import	100.00% <ø> (ø)
xlsx-renderer	100.00% <ø> (ø)

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