octoprint: fix build error on staging-next

[gador]

Description of changes

Octoprint fails to build on current staging-next #188284, due to its flask update.
This fixes it by loosing the requirement.

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandbox = true set in nix.conf? (See Nix manual)
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 22.11 Release Notes (or backporting 22.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
  • (Release notes changes) Ran nixos/doc/manual/md-to-db.sh to update generated release notes
• Fits CONTRIBUTING.md.

[onny]

Do you think it still works? Is there already an upstream patch or issue?

[gador]

it starts and I can print the version string. I we do not apply the patch it doesn't even compile.
I'll have to pull the latest master and run it on my system to be absolutely sure. But all the tests pass, so I would be positively inclined that it works

[onny]

Result of nixpkgs-review pr 190940 run on x86_64-linux 1

1 package built:

• octoprint

[onny]

Thank you!