Update rustls requirement from 0.18 to 0.19 in /dione-server

Created by: dependabot[bot]

Updates the requirements on rustls to permit the latest version.

Commits

• 3c390ef Prepare 0.19.1 with backport
• 47d3092 Prepare for 0.19 release
• cd112e4 Bump MSRV to 1.40
• f5467c1 cargo fmt
• 7224511 Update env_logger requirement from 0.7.1 to 0.8.2
• 20c4dab Trim trailing dot from FQDN in SNI
• 931560d Clean up return types from send_some_plaintext etc
• 716e7ec Update base64 requirement from 0.12.3 to 0.13.0
• fa5a2c3 rustfmt remaining rustls-mio tests
• b311589 rustfmt tlsclient.rs and tlsserver.rs
• Additional commits viewable in compare view

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