fix: show deprecation warning for cacert option

[snitin315]

• This is a bugfix
• This is a feature
• This is a code refactor
• This is a test update
• This is a docs update
• This is a metadata update

For Bugs and Features; did you add new tests?

Yes

Motivation / Use-Case

show deprecation warning for cacert option

Breaking Changes

None

Additional Info

No

[codecov]

Codecov Report

Merging #4115 (0f74aa2) into master (d3858cb) will increase coverage by 0.14%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #4115      +/-   ##
==========================================
+ Coverage   92.64%   92.78%   +0.14%     
==========================================
  Files          14       14              
  Lines        1481     1484       +3     
  Branches      547      548       +1     
==========================================
+ Hits         1372     1377       +5     
+ Misses        101       99       -2     
  Partials        8        8              

Impacted Files	Coverage Δ
lib/Server.js	94.04% <100.00%> (+0.01%)	⬆️
lib/servers/WebsocketServer.js	97.14% <0.00%> (+5.71%)	⬆️

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