Use unix line-endings in bash activate script

[saytosid]

Fixes: #1818

Signed-off-by: Siddhant Kumar skumar619@bloomberg.net

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development documentation)!

• ran the linter to address style issues (tox -e fix_lint)
• wrote descriptive pull request text
• ensured there are test(s) validating the fix
• added news fragment in docs/changelog folder
  - [ ] updated/extended the documentation - N/A, this is a bug fix

[codecov]

Codecov Report

Merging #1924 into master will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1924      +/-   ##
==========================================
- Coverage   93.98%   93.96%   -0.02%     
==========================================
  Files          86       86              
  Lines        4221     4225       +4     
==========================================
+ Hits         3967     3970       +3     
- Misses        254      255       +1     

Flag	Coverage Δ
#tests	93.96% <100.00%> (-0.02%)	⬇️

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Impacted Files	Coverage Δ
src/virtualenv/activation/via_template.py	100.00% <100.00%> (ø)
src/virtualenv/create/via_global_ref/api.py	95.89% <100.00%> (+0.05%)	⬆️
src/virtualenv/util/path/_pathlib/via_os_path.py	91.50% <100.00%> (+0.16%)	⬆️
src/virtualenv/seed/embed/base_embed.py	96.22% <0.00%> (-1.89%)	⬇️

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