doc: Update the used Qt version #24130

1. 
   hebasto commented at 1:16 PM on January 23, 2022: member

   Missed in bitcoin/bitcoin#23489.

2. doc: Update the used Qt version

   A bitcoin/bitcoin#23489 follow up.

   d67fc786d9
3. w0xlt approved
4. 
   w0xlt commented at 1:43 PM on January 23, 2022: contributor

   ACK d67fc78

5. shaavan approved
6. 
   shaavan commented at 1:53 PM on January 23, 2022: contributor

   ACK d67fc786d9978927e317fd313d6666fbc2d6a31e

   A minor but crucial change.

   • Verified that the version by our codebase has been bumped up from 5.12.11 -> 5.15.2 in #23489.
   • This change was not reflected in depend docs until now, which this PR fixes.
7. DrahtBot added the label Docs on Jan 23, 2022
8. prusnak approved
9. 
   prusnak commented at 2:27 PM on January 23, 2022: contributor

   ACK d67fc78

10. 
    DrahtBot commented at 9:37 PM on January 23, 2022: member

    <!--e57a25ab6845829454e8d69fc972939a-->

    The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

    <!--174a7506f384e20aa4161008e828411d-->

    Conflicts

    Reviewers, this pull request conflicts with the following ones:

    • #24132 (build: Bump minimum Qt version to 5.11.3 by hebasto)

    If you consider this pull request important, please also help to review the conflicting pull requests. Ideally, start with the one that should be merged first.

11. 
    promag commented at 9:43 PM on January 23, 2022: member

    ACK d67fc786d9978927e317fd313d6666fbc2d6a31e.

12. MarcoFalke requested review from fanquake on Jan 24, 2022
13. fanquake merged this on Jan 25, 2022
14. fanquake closed this on Jan 25, 2022

    ---

15. hebasto deleted the branch on Jan 25, 2022
16. sidhujag referenced this in commit da240244ab on Jan 28, 2022
17. DrahtBot locked this on Jan 25, 2023

Review Requested
fanquake