Update prost requirement from 0.8 to 0.9 in /dione-server

Created by: dependabot[bot]

Updates the requirements on prost to permit the latest version.

Release notes

Sourced from prost's releases.

v0.9.0

PROST! is a Protocol Buffers implementation for the Rust Language. prost generates simple, idiomatic Rust code from proto2 and proto3 files.

Release 0.9.0 brings in many helpful changes and fixes, here are a few highlights:

• Apple silicon support
• Improve encode/decode varint performance
• Support no package declaration
• Support single include files
• Fix multiple attribute support

Commits

• 7c0916d release 0.9.0
• 75e87f3 Fix derive macro build error when using map and bytes together (#546)
• 1825b38 Fix path in include_file function when outdir used (#544)
• db9cd5c Fix doc comment for field_attribute (#539)
• d7324c4 Escape comments (#510)
• 87cea1d Protect encoding::decode_varint from overflow (#527)
• 4c12921 Updated petgraph to 0.6. (#536)
• 3f2e465 Add option to prost-build to skip the run of protoc (#442)
• 859f243 explicitly use core::default::Default to avoid collisions (#534)
• d45a37c Fix multiple attributes support (#522)
• Additional commits viewable in compare view

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