refactor: use the `node:` protocol

[almeidx]

Please describe the changes this PR makes and why it should be merged:

• https://nodejs.org/api/modules.html#modules_core_modules

Status and versioning classification:

• Code changes have been tested against the Discord API, or there are no code changes
• I know how to update typings and have done so, or typings don't need updating

[almeidx]

Jest added support for the node protocol in 27.1.0

[codecov[bot]]

Codecov Report

Merging #69 (2877b15) into main (65cb8e2) will increase coverage by 3.64%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #69      +/-   ##
==========================================
+ Coverage   85.84%   89.48%   +3.64%     
==========================================
  Files           8        8              
  Lines        1010     1037      +27     
  Branches      101      107       +6     
==========================================
+ Hits          867      928      +61     
+ Misses         42        3      -39     
- Partials      101      106       +5     

Impacted Files	Coverage Δ
packages/rest/src/lib/REST.ts	95.58% <100.00%> (+0.12%)	:arrow_up:
packages/rest/src/lib/RequestManager.ts	93.68% <100.00%> (+11.02%)	:arrow_up:
...ackages/rest/src/lib/handlers/SequentialHandler.ts	83.10% <100.00%> (ø)
packages/rest/src/lib/utils/constants.ts	100.00% <0.00%> (ø)
packages/rest/src/lib/CDN.ts	87.09% <0.00%> (+0.34%)	:arrow_up:
packages/rest/src/lib/errors/DiscordAPIError.ts	79.76% <0.00%> (+3.57%)	:arrow_up:

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