Ignore otel major/minor updates in dependabot

[khrm]

Otel deps must move with knative/pkg; independent bumps are unmergeable.

Changes

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• Has Docs if any changes are user facing, including updates to minimum requirements e.g. Kubernetes version bumps
• Has Tests included if any functionality added or changed
• Follows the commit message standard
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Release Notes

NONE

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[khrm]

/kind misc

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 31.94%. Comparing base (511e6f6) to head (06f1b5d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2070      +/-   ##
==========================================
+ Coverage   31.92%   31.94%   +0.02%     
==========================================
  Files         260      260              
  Lines       11966    11966              
==========================================
+ Hits         3820     3823       +3     
+ Misses       7827     7825       -2     
+ Partials      319      318       -1     

Flag	Coverage Δ
unit-tests	31.94% <ø> (+0.02%)	⬆️

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