adding milestones links

[orangesunny]

Proposed changes

Adding milestones links to all versions since 4.3. It helps admins to check the details before updates.

Checklist

• Lint and unit tests pass locally with my changes.
• I have added tests that prove my fix is effective or that my feature works.
• I have added documentation to describe my feature.
• I have squashed my commits into logic units.
• I have described the changes in the commit messages.

Other information

[codecov]

Codecov Report

Merging #5831 (65f495e) into main (b625330) will decrease coverage by 1.08%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #5831      +/-   ##
==========================================
- Coverage   91.55%   90.47%   -1.09%     
==========================================
  Files         608      608              
  Lines       45752    46490     +738     
  Branches     5041     5109      +68     
==========================================
+ Hits        41889    42062     +173     
- Misses       2592     3158     +566     
+ Partials     1271     1270       -1     

Impacted Files	Coverage Δ
weblate/api/tests.py	67.93% <0.00%> (-32.07%)	⬇️
weblate/api/serializers.py	84.86% <0.00%> (-6.63%)	⬇️
weblate/trans/forms.py	86.25% <0.00%> (-4.50%)	⬇️
weblate/trans/models/component.py	81.59% <0.00%> (-0.38%)	⬇️