chore: Exclude konflux.Dockerfile from Dependabot's updates

[msugakov]

Description

The same change as in stackrox/stackrox#19802 with the only difference that I've not seen Dependabot's PRs in this repo yet.

Checklist

• [ ] Investigated and inspected CI test results
• [ ] Updated documentation accordingly

Automated testing

No change.

Testing Performed

None. GitHub will validate dependabot.yaml. Whether the change works is yet to be seen.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 27.38%. Comparing base (e6d2b84) to head (5d02f73).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3199   +/-   ##
=======================================
  Coverage   27.38%   27.38%           
=======================================
  Files          95       95           
  Lines        5427     5427           
  Branches     2548     2548           
=======================================
  Hits         1486     1486           
  Misses       3214     3214           
  Partials      727      727           

Flag	Coverage Δ
collector-unit-tests	27.38% <ø> (ø)

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