Update Rust crate ron to 0.12.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ron	dev-dependencies	minor	0.11.0 -> 0.12.0

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Release Notes

ron-rs/ron (ron)

v0.12.0

Compare Source

API Changes

• Breaking: Removed the ron::error::Error::Base64Error variant. (#​566)
• Added into_inner() method to ron::ser::Serializer to retrieve the inner writer. (#​588)
• Removed the base64 dependency. (#​566)

Format Changes

• Format-Breaking: Remote base64-encoded byte strings deserialisation, replaced by Rusty byte strings in v0.9.0 (#​566)

Bug Fixes

• Fixed untagged enum deserialisation for serde >= 1.0.220 with better serde content detection (#​582)

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