chore: update terraform-plugin-sdk/v2 to v2.29.0

[t0mk]

Updating TF plugin sdk/v2 to latest in order to migrate to framework. Latest sdkv2 is one of the requirements for the migration.

towards #365

[codecov-commenter]

Codecov Report

Attention: 22 lines in your changes are missing coverage. Please review.

Comparison is base (872618d) 59.56% compared to head (645afab) 60.33%.
Report is 17 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #405      +/-   ##
==========================================
+ Coverage   59.56%   60.33%   +0.77%     
==========================================
  Files          98       99       +1     
  Lines       19754    19889     +135     
==========================================
+ Hits        11767    12001     +234     
+ Misses       7684     7583     -101     
- Partials      303      305       +2     

Files	Coverage Δ
equinix/data_source_metal_port.go	100.00% <100.00%> (ø)
equinix/data_source_metal_spot_market_request.go	89.89% <100.00%> (+6.06%)	⬆️
equinix/helpers_device.go	84.91% <100.00%> (+7.34%)	⬆️
equinix/provider.go	82.14% <100.00%> (+0.05%)	⬆️
equinix/resource_metal_port.go	89.84% <100.00%> (+1.64%)	⬆️
equinix/resource_metal_spot_market_request.go	62.50% <100.00%> (+4.82%)	⬆️
equinix/resource_metal_vrf.go	86.40% <100.00%> (-0.53%)	⬇️
equinix/data_source_metal_device_bgp_neighbors.go	97.65% <94.11%> (+26.56%)	⬆️
equinix/data_source_metal_vrf.go	89.58% <33.33%> (ø)
equinix/port_helpers.go	77.33% <81.81%> (+4.64%)	⬆️
... and 1 more

... and 4 files with indirect coverage changes

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