build(deps): update rustls-pemfile requirement from 1.0.2 to 2.1.0

[dependabot[bot]]

Updates the requirements on rustls-pemfile to permit the latest version.

Release notes

Sourced from rustls-pemfile's releases.

2.1.0

Headlines

• Adds the csr function and the Item::Csr variant to support loading DER encoded Certificate Signing Requests (CSRs) from PEM inputs.

What's Changed

• add certificate signing request by @​Tudyx in rustls/pemfile#37
• Cargo: version 2.0.0 -> 2.1.0 by @​cpu in rustls/pemfile#38

New Contributors

• @​Tudyx made their first contribution in rustls/pemfile#37

Full Changelog: https://github.com/rustls/pemfile/compare/v/2.0.0...v/2.1.0

Commits

• e2d220a Cargo: version 2.0.0 -> 2.1.0
• de3d0ae add certificate signing request
• e0da4ce Bump to v2.0.0
• 12b9d79 Use pki-types v1
• 48790bc Bump version to alpha.2
• 3aa829c add an opt-out std feature
• 0227a3a add read_one_from_slice
• 6e36748 introduce an Error enum
• b3c85f1 refactor read_one's loop body into a separate function
• 2c2f1ab switch from std::prelude to core::prelude
• Additional commits viewable in compare view

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[dependabot[bot]]

Superseded by #143.