openapi-generator-cli: 7.18.0 -> 7.20.0

[utdemir]

I just used the nix-update-script that updated version and the hash, and I manually copied the mvnHash from the build failure.

Things done

• Built on platform:
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• Tested, as applicable:
  • NixOS tests in nixos/tests.
  • Package tests at passthru.tests.
  • Tests in lib/tests or pkgs/test for functions and "core" functionality.
• Ran nixpkgs-review on this PR. See nixpkgs-review usage.
• Tested basic functionality of all binary files, usually in ./result/bin/.
• Nixpkgs Release Notes
  • Package update: when the change is major or breaking.
• NixOS Release Notes
  • Module addition: when adding a new NixOS module.
  • Module update: when the change is significant.
• Fits CONTRIBUTING.md, pkgs/README.md, maintainers/README.md and other READMEs.

[booxter]

There's a bug in this package (or maven integration) that results in hashes not being stable. For example, when I try to build it today, I get this mismatch:

error: build of '/nix/store/gvnfbn2ajy3jbp25chsh8ls1j91b4dxi-maven-deps-openapi-generator-cli-7.20.0.drv' on 'ssh://frame' failed: hash mismatch in fixed-output derivation '/nix/store/gvnfbn2ajy3jbp25chsh8ls1j91b4dxi-maven-deps-openapi-generator-cli-7.20.0.drv':
         specified: sha256-EXSqSBjBEQTerrSuFDdMOVZDAIWXRNZhtUMiI7pWUKQ=
            got:    sha256-Yr0C1vmIhbAA/wVEZKFwpRrKz1Ax7m/acIGwO/U/184=
error: Cannot build '/nix/store/gvnfbn2ajy3jbp25chsh8ls1j91b4dxi-maven-deps-openapi-generator-cli-7.20.0.drv'.

@B4dM4n did a nice job digging into why this happens here but so far, to my knowledge, no one attempted to fix it once and for all. I was planning to continue where this comment left for a while but life happened.

All in all, I think we'll have to fix this hash problem before we are able to bump the version for the package.

[utdemir]

Thanks @booxter - I should've searched before :). I'm happy to close this PR as the previous one has more discussion - once it's fixed it's trivial to update to another version anyway.