revert go-version-file usage in govulncheck gh action

[rsoaresd]

Description

There is a bug when using go-version-file: golang/go#70036, which leads to pick go 1.24 as the go version. Reverting to the first approach of using go-version-input. Slack thread: https://redhat-internal.slack.com/archives/CHK0J6HT6/p1741939607080469?thread_ts=1741889746.719249&cid=CHK0J6HT6

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[MatousJobanek]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: MatousJobanek, rsoaresd, xcoulon

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.66%. Comparing base (5a1e5ca) to head (06e911c).
Report is 1 commits behind head on master.

❌ Your changes status has failed because you have indirect coverage changes. Learn more about Unexpected Coverage Changes and reasons for indirect coverage changes.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1156      +/-   ##
==========================================
- Coverage   79.67%   79.66%   -0.02%     
==========================================
  Files          82       82              
  Lines        8245     8245              
==========================================
- Hits         6569     6568       -1     
- Misses       1480     1481       +1     
  Partials      196      196              

see 1 file with indirect coverage changes

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