Bump the go version to 1.21

[Stefan-Ethernal]

Description

Bump the Go version to 1.21 and upgrade the GH actions versions to the latest ones.

Changes include

• Bugfix (non-breaking change that solves an issue)
• Hotfix (change that solves an urgent issue, and requires immediate attention)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)

Breaking changes

Please complete this section if any breaking changes have been made, otherwise delete it

Checklist

• I have assigned this PR to myself
• I have added at least 1 reviewer
• I have added the relevant labels
• I have added sufficient documentation in code

Additional comments

Please post additional comments in this section if you have them, otherwise delete it

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.89%. Comparing base (14ef0b7) to head (914725e).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #93      +/-   ##
==========================================
+ Coverage   89.68%   89.89%   +0.21%     
==========================================
  Files           7        7              
  Lines        1502     1504       +2     
==========================================
+ Hits         1347     1352       +5     
+ Misses        116      114       -2     
+ Partials       39       38       -1     

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[dusan-maksimovic]

LGTM