Bump pem from 1.1.1 to 3.0.4

[dependabot[bot]]

Bumps pem from 1.1.1 to 3.0.4.

Changelog

Sourced from pem's changelog.

3.0.3

• allow general whitespace separators instead of just newlines

3.0.2

• allow EncodeConfig to be built in a const context

3.0.1

• reduce allocations in pem::encode

3.0.0

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

2.0.1

• Fix serde support on no_std
• Drop MSRV to 1.60

2.0

• Add no_std support
• Bump MSRV to 1.67
• Refactor API to prevent direct modification and access of elements and to allow access to the optional rfc1421-described headers.

Commits

• 81f9c18 chore: Release pem version 3.0.4
• 2cf763c Merge pull request #55 from tottoto/update-to-base64-0.22.0
• b02b194 chore: update to base64 0.22.0
• 594a147 chore: Release pem version 3.0.3
• ccf23ee chore: update changelog
• e64b7f7 Merge pull request #53 from watson28/allow-whitespace-data-segment
• f18bf04 allow whitespaces in data segments
• 446d9db Merge pull request #54 from jcreekmore/fix-tests
• 70b5c96 correct a typo in the docs
• 7db37fa separate building PRs and testing PRs to different versions
• Additional commits viewable in compare view

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