build(deps): bump the rust-example-deps group across 1 directory with 2 updates

[dependabot]

Bumps the rust-example-deps group with 2 updates in the /backend/rust directory: serde_json and tokio.

Updates serde_json from 1.0.149 to 1.0.150

Release notes

Sourced from serde_json's releases.

v1.0.150

• Reject non-string enum object keys (#1324, thanks @​puneetdixit200)

Commits

• a1ae73a Release 1.0.150
• 1a360b0 Merge pull request #1324 from puneetdixit200/reject-non-string-enum-keys
• 2037b63 Reject non-string enum object keys
• 5d30df6 Resolve manual_assert_eq pedantic clippy lint
• dc8003a Raise required compiler for preserve_order feature to 1.85
• a42fa98 Unpin CI miri toolchain
• 684a60e Pin CI miri to nightly-2026-02-11
• 7c7da33 Raise required compiler to Rust 1.71
• acf4850 Simplify Number::is_f64
• 6b8ceab Resolve unnecessary_map_or clippy lint
• Additional commits viewable in compare view

Updates tokio from 1.52.1 to 1.52.3

Release notes

Sourced from tokio's releases.

Tokio v1.52.3

1.52.3 (May 8th, 2026)

Fixed

• sync: fix underflow in mpsc channel len() (#8062)
• sync: notify receivers in mpsc OwnedPermit::release() method (#8075)
• sync: require that an RwLock has max_readers != 0 (#8076)
• sync: return Empty from try_recv() when mpsc is closed with outstanding permits (#8074)

#8062: tokio-rs/tokio#8062 #8074: tokio-rs/tokio#8074 #8075: tokio-rs/tokio#8075 #8076: tokio-rs/tokio#8076

Tokio v1.52.2

1.52.2 (May 4th, 2026)

This release reverts the LIFO slot stealing change introduced in 1.51.0 (#7431), due to [its performance impact]#8065. (#8100)

#7431: tokio-rs/tokio#7431 #8065: tokio-rs/tokio#8065 #8100: tokio-rs/tokio#8100

Commits

• d875691 chore: prepare Tokio v1.52.3 (#8130)
• e1aebb0 Merge 'tokio-1.51.3' into 'tokio-1.52.x' (#8129)
• fd63094 chore: prepare Tokio v1.51.3 (#8127)
• 8c600d0 Merge 'tokio-1.47.5' into 'tokio-1.51.x' (#8123)
• 11bfc13 chore: prepare Tokio v1.47.5 (#8122)
• f085b62 sync: notify receivers in mpsc OwnedPermit::release() method (#8075)
• 30d25cc sync: require that an RwLock has max_readers != 0 (#8076)
• 9fccf53 sync: return Empty from try_recv() when mpsc is closed with outstanding p...
• ebf61b4 sync: fix underflow in mpsc channel len() (#8062)
• 4abe9d7 chore: prepare Tokio v1.52.2 (#8115)
• Additional commits viewable in compare view

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