ci: fix chainguard claim pattern

[PROFeNoM]

Description

Following the pattern from vaccine, we don't need the claim_pattern at all

https://github.com/DataDog/vaccine/blob/master/.github/chainguard/dd-trace-rb.dispatch.sts.yaml

Reviewer checklist

• Test coverage seems ok.
• Appropriate labels assigned.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.92%. Comparing base (038e72c) to head (0358565).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3351      +/-   ##
==========================================
+ Coverage   61.84%   61.92%   +0.08%     
==========================================
  Files         140      140              
  Lines       12356    12356              
  Branches     1616     1616              
==========================================
+ Hits         7641     7651      +10     
+ Misses       4003     3995       -8     
+ Partials      712      710       -2     

see 3 files with indirect coverage changes

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