improve: use errors.New to replace fmt.Errorf with no parameters

[0x2d3c]

Some parameterless errors should be using errors.New instead of fmt.Errorf

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 52.71%. Comparing base (1809680) to head (b583a1a).
Report is 1 commits behind head on main.

Files	Patch %	Lines
share/eds/store_options.go	0.00%	3 Missing ⚠️
cmd/auth.go	0.00%	1 Missing ⚠️
cmd/rpc.go	0.00%	1 Missing ⚠️
core/fetcher.go	0.00%	1 Missing ⚠️
core/listener.go	0.00%	1 Missing ⚠️
das/daser.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3206      +/-   ##
==========================================
+ Coverage   51.92%   52.71%   +0.78%     
==========================================
  Files         178      178              
  Lines       11316     9317    -1999     
==========================================
- Hits         5876     4911     -965     
+ Misses       4942     3907    -1035     
- Partials      498      499       +1     

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