Migrate to Scala 3.9.0 LTS - #525
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- scalaVersion 3.3.8 -> 3.9.0; Scala Steward pin 3.3. -> 3.9.
- drop -Yfuture-lazy-vals: rejected by 3.9 ("bad option"), VarHandle-based
lazy vals are the default since 3.8
- KafkaStage: pass the SortedSet ordering with `using` (3.9 no longer
accepts an explicit argument list for the implicit parameter there)
- resource.scala: with 3.9, the NoEnclosingConcurrencyScope given is emitted
returning void, so the BoxedUnit version (linked by code compiled with
3.3) is now provided explicitly via @TargetNAME; keeps MiMa green
(scala/scala3#24653)
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
- `_` type wildcards -> `?`, `xs: _*` -> `xs*`, `= _` -> `= uninitialized` - remove unused imports/params/pattern vars reported by the new unused checker (`@unused` where the parameter is part of the public API) - remove a written-but-never-read `successCalls` counter in CircuitBreakerStateMachine - `@unchecked` type tests for local classes in flattenPar / groupBy (TODO(scala-3.9)) Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Needs scala 3.9+ - probably needs new minor version