Increase key size to 4096

[omllobet]

Describe the pull request:

• [ ] Bug fix
• [ ] Functional change
• [ ] New feature
• [X] Code cleanup
• [ ] Build system change
• [ ] Documentation change
• [ ] Language translation

Pull request long description:

This pull request increases the size of the generated keys in the bootstrap to 4096. This is to avoid the error ssl.SSLError: [SSL: EE_KEY_TOO_SMALL] ee key too small (_ssl.c:3991) produced in versions of openssl with an increased security level configured. See Openssl security level

Changes made:

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Additional information:

Release note:

Documentation change:

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