build(deps): update rcgen requirement from 0.12.0 to 0.13.1

[dependabot[bot]]

Updates the requirements on rcgen to permit the latest version.

Commits

• 6432225 rcgen: 0.13.0 -> 0.13.1
• 76ec87a docs: update CHANGELOG for 0.13.1
• 72714e5 cert: use key_identifier_method of issuer for AKI
• 7db8619 examples: sign-leaf-with-ca uses ca key for signing end entity cert
• 4853083 cli: add more Cargo metadata
• 25c6c20 Set library version for CLI crate
• b9f9298 Fix reference in changelog about RSA key generation
• 3daef5e docs: update CHANGELOG for 0.13.0
• 17032f0 Support all PrivateKeyDer formats when using aws-lc-rs feature
• 8974b7f tests: add simple CSR round-trip
• Additional commits viewable in compare view

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