Don't list an issue on its own dependency list UI.

[HarshitOnGitHub]

We need to disable the cache here otherwise we keep listing the issues even after they get closed.

Fixes: #4684.

[codecov-io]

Codecov Report

Merging #5658 into master will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5658      +/-   ##
==========================================
- Coverage   37.79%   37.76%   -0.03%     
==========================================
  Files         325      325              
  Lines       47671    47671              
==========================================
- Hits        18016    18005      -11     
- Misses      27067    27071       +4     
- Partials     2588     2595       +7

Impacted Files	Coverage Δ
models/repo_indexer.go	44.49% <0%> (-6.36%)	⬇️
models/repo_list.go	64.55% <0%> (+1.26%)	⬆️
models/unit.go	14.28% <0%> (+14.28%)	⬆️

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[HarshitOnGitHub]

(Forgot to mention that you will need to clear your browser's session storage before testing the PR otherwise you will see wrong results.)