devel/ruby-redmine: update to 4.0.9

4.0.9 (2021-04-26)

[Gems support]

* Patch #34969: Remove dependency on MimeMagic

[Rails support]

* Patch #34966: Update Rails to 5.2.5

[Security]

* Defect #34367: Allowed filename extensions of attachments can be
  circumvented
* Defect #34950: SysController and MailHandlerController are vulnerable to
  timing attack
* Defect #35045: Mail handler bypasses add_issue_notes permission
* Defect #35085: Arbitrary file read in Git adapter

[UI]

* Patch #34955: Update copyright year in the footer to 2021

(taca)