Declare Go 1.19 as minimum version

[hansgylling]

Description

Declare Go 1.19 as minimum version since that's the lowest Go version that can actually build the example programs and run the tests.

Reference issue

Fixes #2728

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.29%. Comparing base (eb6e395) to head (500f5e8).
Report is 1 commits behind head on v3.

Additional details and impacted files

@@            Coverage Diff             @@
##               v3    #2729      +/-   ##
==========================================
- Coverage   76.32%   76.29%   -0.04%     
==========================================
  Files          87       87              
  Lines        9846     9846              
==========================================
- Hits         7515     7512       -3     
- Misses       1866     1868       +2     
- Partials      465      466       +1     

Flag	Coverage Δ
go	77.82% <ø> (-0.04%)	⬇️
wasm	64.44% <ø> (ø)

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[hansgylling]

There seems to be 3 more errors from golangci-lint in the lint workflow in this PR compared to the PR before. This is caused by the Go version increase since package io/ioutil was deprecated in Go 1.19. See line 115-118 in the output from golangci-lint. Should I change those 3 uses of io/ioutil in this PR?

Note how the Metadata job in the lint workflow now succeeds compared to before.

Previous job: https://github.com/pion/webrtc/actions/runs/8543153832/job/23406318178

Now: https://github.com/pion/webrtc/actions/runs/8545312740/job/23413312806?pr=2729

[Sean-Der]

Thank you so much @hansgylling!

Not having to manage configs for every repo is nice, but it is frustrating that as older code bitrots you have this drift :/