Bump json_serializable from 6.7.1 to 6.8.0

[dependabot[bot]]

Bumps json_serializable from 6.7.1 to 6.8.0.

Release notes

Sourced from json_serializable's releases.

package:json_serializable v6.8.0

• Add type arguments to Map literals used for Record serialization.
• Add support for JsonSerializable(createJsonKeys: true). (#1401)
• Handle decoding an int value from a double literal. This now matches the behavior of double values being encoded as int.

Commits

• 9694cc5 json_serializable: publish v6.8.0 (#1418)
• eea959d json_annotation: prepare to release v4.9.0 (#1417)
• dbe976a Make casts to int safe in dart2wasm. (#1416)
• 1694d6f Bump actions/checkout from 4.1.1 to 4.1.2 (#1410)
• 1bfb616 Bump actions/cache from 4.0.1 to 4.0.2 (#1411)
• 5b46ef9 Added createJsonKeys (#1401)
• 324acee Bump actions/cache from 4.0.0 to 4.0.1 (#1404)
• 24a830c Bump dart-lang/setup-dart from 1.6.1 to 1.6.2 (#1396)
• 3a833d9 Bump DavidAnson/markdownlint-cli2-action from 14.0.0 to 15.0.0 (#1395)
• 28f7c9a Bump actions/cache from 3.3.3 to 4.0.0 (#1397)
• Additional commits viewable in compare view

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