chore(deps): update rust crate pem to v3

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This PR contains the following updates:

Package	Type	Update	Change
pem (source)	workspace.dependencies	major	1 -> 3

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Release Notes

jcreekmore/pem-rs (pem)

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

v2.0.1

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• Fix serde support on no_std
• Drop MSRV to 1.60

v2.0.0

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v1.1.1

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• Allow PEM files to be parsed with the optional rfc1421-described headers
  (although you cannot retrieve the headers)

v1.1.0

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• Add optional serde support

v1.0.2

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• Remove dependency on Regex in favor of a hand-rolled parser

v1.0.1

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• hide the ASCII_ARMOR symbol to work around a linking issue with 32-bit windows builds

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