Update derivation to not install old shell-completions
Update module to load completion for bash, fish (new) and zsh (or oh-my-zsh plugin) with changed way through fzf-binary
Added change to release note as it is backwards-incompatible.

Diff: junegunn/fzf@0.48.1...0.49.0

Changelog: https://github.com/junegunn/fzf/blob/0.49.0/CHANGELOG.md

The fzf-share helper was added to help to find the shell scripts [1],
but since fzf≥0.48.0 the it's no longer needed because fzf has its shell
integration scripts embedded.

[1] NixOS#27709

Since fzf 0.43.0, the history command only uses Perl if it's installed
otherwise uses Awk [1].

[1] junegunn/fzf@9f7684f

`fzf-share` was removed