fix: basic auth invalid base64 string

[wellingguzman]

fixes #2170

[codecov]

Codecov Report

Merging #2191 (9bd1c7a) into master (d5f8837) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2191      +/-   ##
==========================================
+ Coverage   92.20%   92.26%   +0.06%     
==========================================
  Files          37       37              
  Lines        3090     3090              
==========================================
+ Hits         2849     2851       +2     
+ Misses        151      150       -1     
+ Partials       90       89       -1     

Impacted Files	Coverage Δ
middleware/basic_auth.go	71.87% <100.00%> (+6.25%)	⬆️

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[aldas]

LGTM