Update java-server to Ditto SDK 5.0.0 GA

[Brian Plattenburg (bplattenburg)]

Bumps com.ditto:ditto-java and com.ditto:ditto-binaries from 5.0.0-java to 5.0.0 GA.

5.0.0 dropped two convenience surfaces that this app was using:

• ditto.startSync() / ditto.stopSync() removed — use ditto.getSync().start() / .stop() instead.
• DittoStore.execute(...) now returns CompletionStage<Void> (fire-and-forget). For SELECTs that need a DittoQueryResult, use executeRaw(...). INSERT/UPDATE call sites that ignored the result are unchanged in behavior.

Also fixes the README API reference link, which still pointed at v4.11.

Verified locally: ./gradlew check passes (compile + PMD + SpotBugs).

[Copilot]

Pull request overview

This PR updates the Java server quickstart to Ditto SDK 5.0.0 GA and adapts the code to SDK API changes (sync start/stop API, and DQL execution API changes for SELECT queries).

Changes:

• Bump com.ditto:ditto-java / com.ditto:ditto-binaries from 5.0.0-java to 5.0.0.
• Migrate sync controls from ditto.startSync()/stopSync() to ditto.getSync().start()/stop().
• Switch SELECT call sites from execute(...) to executeRaw(...) and update the README API reference link.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
java-server/src/main/java/com/ditto/example/spring/quickstart/service/DittoTaskService.java	Updates SELECT query execution to executeRaw(...) for Ditto v5 GA.
java-server/src/main/java/com/ditto/example/spring/quickstart/service/DittoService.java	Updates sync start/stop usage and SELECT query execution to executeRaw(...); aligns with new execute(...) return type.
java-server/README.md	Updates API reference link to Ditto Java SDK 5.0.0.
java-server/build.gradle.kts	Bumps Ditto Java dependencies to 5.0.0 GA.

Comments suppressed due to low confidence (1)

java-server/src/main/java/com/ditto/example/spring/quickstart/service/DittoTaskService.java:56

• toggleTaskDone assumes the SELECT returns at least one row (tasks.getItems().get(0)), which will throw IndexOutOfBoundsException if an invalid/nonexistent taskId is posted to /tasks/{taskId}/toggle. Handle the empty result case explicitly (e.g., no-op, return 404/IllegalArgumentException, or similar) before accessing the first item.

            DittoQueryResult tasks = dittoService.getDitto().getStore().executeRaw(
                    "SELECT * FROM %s WHERE _id = :taskId".formatted(TASKS_COLLECTION_NAME),
                    DittoCborSerializable.Dictionary.buildDictionary()
                            .put("taskId", taskId)
                            .build()
            ).toCompletableFuture().join();

            boolean isDone = tasks.getItems().get(0).getValue().get("done").asBoolean();

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