chore(deps): update dependency phpseclib/phpseclib to v4

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Confidence
phpseclib/phpseclib (source)	^3.0 → ^4.0
phpseclib/phpseclib (source)	^2.0||^3.0 → 4.0.0

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Release Notes

phpseclib/phpseclib (phpseclib/phpseclib)

v4.0.0

Compare Source

• split CSR / CRL / SPKAC out from X509
• add PFX / CMS support
• implement lazy loading for ASN1
• SSH2/SFTP: throw exceptions instead of returning false
• bump minimum required PHP version to 8.1.0
• namespace changed from \phpseclib3 to \phpseclib4 to facilitate a yet to be written phpseclib 3 shim (phpseclib3_compat)

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