Remove vendor directory and update dependency and build tool versions

[displague]

• remove vendor/
• remove unused .travis.yml
• adds a changelog stub for the next release
• update versions of GH Action setup-go
• bumps go to 1.17
• bumps packngo to 0.22.0 (conflicts with https://github.com/equinix/terraform-provider-metal/pull/209)
• fix testAccMetalConnectionConfig_Tunnel test

[codecov-commenter]

Codecov Report

Merging #213 (48161bc) into main (483372a) will increase coverage by 0.48%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #213      +/-   ##
==========================================
+ Coverage   76.26%   76.74%   +0.48%     
==========================================
  Files          48       48              
  Lines        6223     6223              
==========================================
+ Hits         4746     4776      +30     
+ Misses       1256     1220      -36     
- Partials      221      227       +6     

Impacted Files	Coverage Δ
metal/utils.go	60.00% <0.00%> (-12.50%)	:arrow_down:
metal/errors.go	67.88% <0.00%> (-10.10%)	:arrow_down:
metal/resource_metal_spot_market_request.go	52.49% <0.00%> (-2.30%)	:arrow_down:
metal/port_helpers.go	65.01% <0.00%> (-2.29%)	:arrow_down:
metal/helpers_device.go	82.53% <0.00%> (+0.52%)	:arrow_up:
metal/resource_metal_device.go	66.82% <0.00%> (+1.89%)	:arrow_up:
metal/resource_metal_device_network_type.go	68.42% <0.00%> (+6.31%)	:arrow_up:
metal/resource_metal_organization.go	62.06% <0.00%> (+13.79%)	:arrow_up:
metal/datasource_metal_organization.go	68.57% <0.00%> (+21.90%)	:arrow_up:

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