Motivation for this change

The Flannel package current version (0.6.2) is from 2016. Since it is used as default CNI implementation in Kubernetes, it seems a bit scary to use such an old version.

Added myself as maintainer on the package.

Ran both the kubernetes RBAC and DNS test cases, and they both work fine with flannel 0.11.0.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Assured whether relevant documentation is up to date
• Fits CONTRIBUTING.md.