Update Rust crate bon to v3.4.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
bon (source)	dependencies	minor	=3.3.2 -> =3.4.0

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Release Notes

elastio/bon (bon)

v3.4.0

Compare Source

Added

• Stabilize the current #[builder(getter)] attribute MVP (#​251).
  The cargo feature experimental-getters is no longer needed and is now no-op.
• Make self receiver and start_fn members available as official fields on the builder (#​250).
  Check the new documentation page about native fields.
• Introduce #[builder(derive(Into))] attribute to generate an impl From<Builder> for T (#​248).
  See the updated "Inspecting" guide page now known as Derives for Builders and the updated #[builder(derive)] reference.

Other

• Fix a typo on the front page of the website 😳 (#​243). Thanks @​MegaRedHand for the contribution!
• Add OpenCollective funding option (#​241)
• Regular maintenance (#​244, #​246, #​249, #​253)

Acknowledgements

• Gratitude to the Kindness.ai team who started supporting on OpenCollective at 100$ a month!
• Gratitude to Ethan Skowronski who started supporting on Patreon at 1$ a month!

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