Update rcgen requirement from 0.8 to 0.9

[dependabot[bot]]

Updates the requirements on rcgen to permit the latest version.

Changelog

Sourced from rcgen's changelog.

Release 0.9.0 - February 2, 2022

• Add RemoteKeyError for usage by remote keys.
• Support non utf8 strings. Contributed by omjadas.
• Switch from chrono to time. Contributed by connec.
• Update edition to 2021.

Release 0.8.14 - October 14, 2021

• Update pem to 1.0.
• Update x509-parser to 0.12.

Release 0.8.13 - August 22, 2021

• Bugfix release to make Certificate Send and Sync again.

Release 0.8.12 - August 22, 2021

• Use public key as default serial number. Contributed by jpastuszek.
• Add support for PKCS_RSA_SHA512 and PKCS_RSA_SHA384 signature algorithms.
• Add support for the keyUsage extension. Contributed by jaredwolff.
• Ability to use remote keys. Contributed by daxpedda.

Release 0.8.11 - April 28, 2021

• Add getters for the criticality, content, and oid_components of a CustomExtension
• Update yasna to 0.4

Release 0.8.10 - April 15, 2021

• Implement some additional traits for some of the types. Contributed by zurborg.
• Adoption of intra-doc-links
• Addition of the ability to zero key pairs. Contributed by didier-wenzek.

Release 0.8.9 - December 4, 2020

• Switch CI to Github Actions.
• Strip nanos from DateTime as well. Contributed by @​trevor-crypto.

Release 0.8.7 - December 1, 2020

• Turn botan back into a dev-dependency. Contributed by @​nthuemmel.
• Fix signing when CA uses different signing algorithm . Contributed by @​nthuemmel.

Release 0.8.6 - December 1, 2020

• Add KeyPair::from_der
• Add botan based test to the testsuite
• Update x509-parser to 0.9. Contributed by @​djc.
• Ability to create certificates from CSRs. Contributed by @​djc.

... (truncated)

Commits

• 33e8d31 Release 0.9.0
• 1b239b0 Add changelog for 0.9.0
• 28a7562 Remove extern crate statements
• 28808d9 Update edition to 2021
• cf17b3d Switch from chrono to time
• 724a9a8 chore: use ia5_string for Rfc822Name and DnsName
• 2335888 test: add tests
• 2fb1ca4 feat: support non utf8 strings
• bb494ee Implement TryForm<Vec> for KeyPair struct (#70)
• acf4840 Add RemoteKeyError that remote key operations can use to indicate errors
• Additional commits viewable in compare view

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[djc]

Filed an issue about the MSRV: https://github.com/est31/rcgen/issues/75.

[dependabot[bot]]

Looks like rcgen is up-to-date now, so this is no longer needed.