v1.21.7

* ENHANCEMENTS
  * Users with `read` permission of pull requests can be assigned too (#27263) (#29372)
* BUGFIXES
  * Do not double close reader (#29354) (#29370)
  * Display friendly error message (#29105) (#29363)
  * Fix project counter in organization/individual profile (#28068) (#29361)
  * Fix validity of the FROM email address not being checked (#29347) (#29360)
  * Fix tarball/zipball download bug (#29342) (#29352)
* DOCS
  * Docker Tag Information in Docs (#29047) (#29362)
* MISC
  * Enforce maxlength in frontend (#29389) (#29396)
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