update: cosign v1.2.1 to v1.3.0

[xopham]

Fixes no issue

Description

• updates cosign to v1.3.0
• fixes 1 vulnerabilities introduced via cosign
• some configuration and outputs of cosign were changed and had to be adjusted

Checklist

• PR is rebased to/aimed at branch develop
• PR follows Contributing Guide
• Added tests (if necessary)
• Extended README/Documentation (if necessary)
• Adjusted versions of image and Helm chart in values.yaml and Chart.yaml (if necessary)

[codecov-commenter]

Codecov Report

Merging #404 (32cd4ad) into develop (232e5b7) will increase coverage by 0.30%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #404      +/-   ##
===========================================
+ Coverage    96.68%   96.99%   +0.30%     
===========================================
  Files           21       21              
  Lines         1057     1064       +7     
===========================================
+ Hits          1022     1032      +10     
+ Misses          35       32       -3     

Impacted Files	Coverage Δ
connaisseur/validators/cosign/cosign_validator.py	96.25% <100.00%> (ø)
connaisseur/alert.py	97.93% <0.00%> (+0.13%)	⬆️
connaisseur/flask_server.py	91.46% <0.00%> (+0.21%)	⬆️
...naisseur/validators/notaryv1/notaryv1_validator.py	98.30% <0.00%> (+2.50%)	⬆️

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[Starkteetje]

lgtm