fix: 絵文字のライセンスのActivityPub contextを追加

[noellabo]

fix #15182

[github-actions]

このPRによるapi.jsonの差分
差分はありません。
Get diff files from Workflow Page

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 38.77%. Comparing base (8d7b1f2) to head (087b9be).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #15318      +/-   ##
===========================================
- Coverage    40.45%   38.77%   -1.69%     
===========================================
  Files         1605     1601       -4     
  Lines       209680   203860    -5820     
  Branches      4082     4011      -71     
===========================================
- Hits         84836    79050    -5786     
+ Misses      124240   124174      -66     
- Partials       604      636      +32     

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[anatawa12]

https://json-ld.org/playground/ などで試した結果これを適用した方が正しそうだった

[mi-gh-maintainer]

Thank you 🙏