Fix extra line with Dart 3.7 syntax (#1478)

Since this package is using 3.6, you can't see the result here
Verified with a one-off in this package and another package to make
sure nothing breaks

Error out if the language version of the target package is too low (#…

…1474)

Much be at least 3.0 since we generate code with case statements

Fixes #1462

Actually bump pkg:analyzer dep (#1466)

Support latest packages, bump min SDK to 3.6 (#1465)

Prepare release 6.9 (#1458)

json_serializable: publish v6.8.0 (#1418)

json_annotation: prepare to release v4.9.0 (#1417)

Support latest pkg:analyzer, release v6.7.1 (#1333)

Records: more testing (#1320)