Log Message:
gitea: Update to 1.9.4

* BUGFIXES
  * Highlight issue references (#8101) (#8404)
  * Fix bug when migrating a private repository #7917 (#8403)
  * Change general form binding to gogs form (#8334) (#8402)
  * Fix editor commit to new branch if PR disabled (#8375) (#8401)
  * Fix milestone num_issues (#8221) (#8400)
  * Allow users with explicit read access to give approvals (#8398)
  * Fix commit status in PR #8316 and PR #8321 (#8339)
  * Fix API for edit and delete release attachment (#8290)
  * Fix assets on release webhook (#8283)
  * Fix release API URL generation (#8239)
  * Allow registration when button is hidden (#8238)
  * MS Teams webhook misses commit messages (backport v1.9) (#8225)
  * Fix data race (#8206)
  * Fix pull merge 500 error caused by git-fetch breaking behaviors (#8194)
  * Fix the SSH config specification in the authorized_keys template (#8193)
  * Fix reading git notes from nested trees (#8189)
  * Fix team user api (#8172) (#8188)
  * Add reviewers as participants (#8124)
* BUILD
  * Use vendored go-swagger (#8087) (#8165)
  * Fix version-validation for GO 1.13 (go-macaron/cors) (#8389)
* MISC
  * Make show private icon when repo avatar set (#8144) (#8175)