Updated script to use /usr/bin/env

[Risto-Stevcev]

The script uses /bin/bash which isn't compatible with NixOS. This updates it to use /usr/bin/env bash instead

[codecov-commenter]

Codecov Report

Merging #244 into master will decrease coverage by 0.20%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #244      +/-   ##
==========================================
- Coverage   81.71%   81.50%   -0.21%     
==========================================
  Files          68       66       -2     
  Lines        5414     5353      -61     
==========================================
- Hits         4424     4363      -61     
  Misses        990      990              

Impacted Files	Coverage Δ
autoload/iced/buffer.vim	98.14% <0.00%> (-1.86%)	⬇️
autoload/iced/component/format/native_image.vim	91.84% <0.00%> (-1.64%)	⬇️
autoload/iced/util.vim	98.27% <0.00%> (-0.87%)	⬇️
autoload/iced/component/format/nrepl.vim	90.84% <0.00%> (-0.66%)	⬇️
autoload/iced/component/job/neovim.vim
autoload/iced/component/virtual_text/neovim.vim

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[liquidz]

@Risto-Stevcev Thanks for your contribution!
Could you update this file too?
https://github.com/liquidz/vim-iced/blob/master/clj/template/iced.bash

[liquidz]

@Risto-Stevcev Thanks!