deps: bump dvc-gs to 2.21.1

[pmrowla]

• ❗ I have followed the Contributing to DVC checklist.

• 📖 If this PR requires documentation updates, I have created a separate PR (or issue, at least) in dvc.org and linked it here.

Thank you for the contribution - we'll try to review it as soon as possible. 🙏

Fixes bug where version-aware import-url/update did not work with remote://

[codecov]

Codecov Report

Base: 93.33% // Head: 93.02% // Decreases project coverage by -0.32% ⚠️

Coverage data is based on head (daa626b) compared to base (465d886).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8919      +/-   ##
==========================================
- Coverage   93.33%   93.02%   -0.32%     
==========================================
  Files         453      453              
  Lines       36433    36433              
  Branches     5269     5269              
==========================================
- Hits        34004    33890     -114     
- Misses       1915     2003      +88     
- Partials      514      540      +26     

Impacted Files	Coverage Δ
tests/func/test_unprotect.py	78.57% <0.00%> (-21.43%)	⬇️
tests/unit/utils/test_utils.py	83.33% <0.00%> (-16.67%)	⬇️
tests/unit/test_daemon.py	85.18% <0.00%> (-14.82%)	⬇️
dvc/utils/fs.py	83.63% <0.00%> (-10.91%)	⬇️
tests/unit/proc/test_manager.py	89.28% <0.00%> (-10.72%)	⬇️
dvc/proc/manager.py	66.66% <0.00%> (-9.68%)	⬇️
tests/unit/utils/test_fs.py	88.42% <0.00%> (-9.48%)	⬇️
dvc/proc/exceptions.py	86.66% <0.00%> (-6.67%)	⬇️
dvc/config_schema.py	88.57% <0.00%> (-5.72%)	⬇️
dvc/analytics.py	88.73% <0.00%> (-4.23%)	⬇️
... and 15 more

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