fix: update expired TUF test data

[0xiso]

This PR updates the expired TUF test data which was causing test failures.

Changes

• Regenerated pkg/reconciler/trustroot/testdata/root.json and pkg/reconciler/trustroot/testdata/tufRepo.tar using make generate-testdata.
• Updated hardcoded base64 encoded test data in pkg/apis/policy/v1alpha1/trustroot_validation_test.go and pkg/tuf/repo_test.go.

Files Modified (Manually)

• pkg/apis/policy/v1alpha1/trustroot_validation_test.go
• pkg/tuf/repo_test.go

Commands Run

• make generate-testdata

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 29.98%. Comparing base (ea54b96) to head (e09f67f).
⚠️ Report is 44 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1920       +/-   ##
===========================================
- Coverage   42.78%   29.98%   -12.80%     
===========================================
  Files         121      122        +1     
  Lines        8994     7323     -1671     
===========================================
- Hits         3848     2196     -1652     
- Misses       4791     4894      +103     
+ Partials      355      233      -122     

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[hectorj2f]

you should only need to update two files as done in here https://github.com/sigstore/policy-controller/pull/1496/files

[0xiso]

@hectorj2f I followed the example in that PR and updated only the two files, however the tests are failing. Am I missing any additional changes that are required?

[hectorj2f]

It looks like we must update it now in additional places too https://github.com/sigstore/policy-controller/actions/runs/20930413044/job/60139572158?pr=1920

[0xiso]

@hectorj2f Thanks for the feedback! I've reverted the PR to its initial state.

This PR regenerates all the testdata files using go run hack/gentestdata/gentestdata.go and updates the hardcoded base64 values in both trustroot_validation_test.go and repo_test.go. This matches the approach taken in #1857, which also updated the same set of 16 files.

All tests are passing.