fix: increase RSA key size in FederationKeys.ts

[julio-rocketchat]

Fix for https://github.com/RocketChat/Rocket.Chat/security/code-scanning/399

To fix the problem, we need to increase the RSA key size to at least 2048 bits. This change will ensure that the generated keys are secure and comply with modern cryptographic standards.

Specifically, we will update the line new NodeRSA({ b: 512 }) to use a key size of 2048 bits. This change will not affect the existing functionality of the code but will enhance the security of the generated keys.

https://rocketchat.atlassian.net/browse/VLN-92

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Latest commit: 79b69da

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[dionisio-bot]

Looks like this PR is not ready to merge, because of the following issues:

• This PR is targeting the wrong base branch. It should target 7.4.0, but it targets 7.3.0

Please fix the issues and try again

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[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.17%. Comparing base (0858ce5) to head (850bc54).
Report is 1 commits behind head on develop.

Additional details and impacted files

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  Coverage    59.17%   59.17%           
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  Files         2822     2822           
  Lines        68118    68118           
  Branches     15145    15145           
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  Hits         40312    40312           
  Misses       24975    24975           
  Partials      2831     2831           

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