Upgrade golangci-lint, more linters

[JoeTurki]

Description

Introduces new linters and resolves issues with the latest golangci-lint version (v1.63.4).

pion/.goassets#220

[codecov]

Codecov Report

Attention: Patch coverage is 85.18519% with 32 lines in your changes missing coverage. Please review.

Project coverage is 81.79%. Comparing base (527176e) to head (839bffc).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
vnet/router.go	80.00%	6 Missing and 1 partial ⚠️
test/bridge.go	70.58%	5 Missing ⚠️
connctx/connctx.go	60.00%	2 Missing ⚠️
netctx/conn.go	60.00%	2 Missing ⚠️
netctx/packetconn.go	60.00%	2 Missing ⚠️
udp/batchconn.go	33.33%	2 Missing ⚠️
udp/conn.go	88.23%	2 Missing ⚠️
vnet/nat.go	90.90%	0 Missing and 2 partials ⚠️
connctx/pipe.go	0.00%	1 Missing ⚠️
deadline/deadline.go	85.71%	1 Missing ⚠️
... and 6 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #324      +/-   ##
==========================================
- Coverage   81.86%   81.79%   -0.08%     
==========================================
  Files          39       39              
  Lines        3337     3445     +108     
==========================================
+ Hits         2732     2818      +86     
- Misses        478      500      +22     
  Partials      127      127              

Flag	Coverage Δ
go	81.70% <85.18%> (-0.07%)	⬇️
wasm	63.99% <66.20%> (-0.31%)	⬇️

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