deps: update golang docker tag to v1.20.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
golang	stage	patch	1.20.0-alpine3.16 -> 1.20.1-alpine3.16

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov]

Codecov Report

Merging #844 (e98ba49) into main (140b2f2) will increase coverage by 0.02%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #844      +/-   ##
==========================================
+ Coverage   58.52%   58.55%   +0.02%     
==========================================
  Files          97       97              
  Lines        7552     7552              
==========================================
+ Hits         4420     4422       +2     
+ Misses       2939     2938       -1     
+ Partials      193      192       -1     

Impacted Files	Coverage Δ
...lers/lifecycle/keptnworkloadinstance/controller.go	81.16% <0.00%> (-0.45%)	⬇️
...ptnworkloadinstance/reconcile_prepostevaluation.go	90.90% <0.00%> (+9.09%)	⬆️

Flag	Coverage Δ
component-tests	41.52% <ø> (-0.14%)	⬇️
keptn-lifecycle-operator	54.67% <ø> (ø)
klt-cert-manager	67.50% <ø> (ø)
scheduler	21.17% <ø> (ø)

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