⬆️ deps(cargo): update rust crate pem to v3

[Open-Source-Bot]

This PR contains the following updates:

Package	Type	Update	Change
pem (source)	dependencies	major	2.0.1 → 3.0.0

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Release Notes

jcreekmore/pem-rs (pem)

v3.0.6

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• switch from serde to serde_core

v3.0.5

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• updated base version in the docs

v3.0.4

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• updated base64 to 0.22.0

v3.0.3

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• allow general whitespace separators instead of just newlines

v3.0.2

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• allow EncodeConfig to be built in a const context

v3.0.1

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• reduce allocations in pem::encode

v3.0.0

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• trim proptest features to prevent an MSRV break for testing
• make EncodeConfig struct extendable and add a line_wrap config option

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This PR has been generated by Mend Renovate.