Update ISSUE_TEMPLATE

[cleptric]

We no longer use the forum and the security section shows up twice, as it's also configured globally in our org.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.82%. Comparing base (5a5b81c) to head (d935dea).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1079      +/-   ##
==========================================
- Coverage   86.90%   86.82%   -0.08%     
==========================================
  Files          55       56       +1     
  Lines        6011     6013       +2     
==========================================
- Hits         5224     5221       -3     
- Misses        643      647       +4     
- Partials      144      145       +1     

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