Prepare 1.11.0 release: dep bumps, versions targets, and docs

[pambrose]

Summary

• Version 1.10.0 → 1.11.0 (gradle.properties).
• Dependencies: readingbat-core / readingbat-kotest 3.4.0 → 3.5.0, core-utils 3.2.2 → 5.1.1, Kotlin 2.4.10 → 2.4.21, ben-manes versions plugin 0.64.0 → 0.66.0.
• Gradle wrapper 9.7.1 → 9.8.1 via make upgrade-wrapper: gradle-wrapper.properties, gradle-wrapper.jar, gradlew.bat, and the gradle-wrapper catalog key.
• make versions / make versions-all, matching canvas-cache:
  • A custom outputFormatter on DependencyUpdatesTask in build.gradle.kts makes make versions print only outdated dependencies, any that couldn't be checked, and a newer Gradle release.
  • The new make versions-all passes --output-formatter=plain to get the plugin's full report.
• org.gradle.jvmargs in gradle.properties: 4 GB Gradle/Kotlin daemon heap, heap dump on OOM, UTF-8 encoding.
• Docs: CHANGELOG.md, RELEASE_NOTES.md (v1.11.0), llms.txt, README.md, CLAUDE.md.

No DSL, content, or runtime source changes; the build still targets JDK 25.

Notes for review

• core-utils 5.x drops or changes some public API. Removed or changed: ScopeFunctionsKt, ThreadSafeSingleAssignVar, waitForPortAvailable (now returns Boolean), toCreated, and a few constructors. The template doesn't use any of them, and readingbat-core 3.5.0 moved its common-utils modules to 5.1.1, so dependencyInsight shows the whole classpath on 5.1.1 with no conflict resolution.
• New Gradle 9.8.1 deprecation warning. Every build prints "Deprecated Gradle features were used…". It comes from detekt 2.0.0-alpha.6 calling Configuration.setVisible(), which is scheduled for removal in Gradle 11. It's documented in the release notes.
• make versions no longer writes build/dependencyUpdates/report.txt. make versions-all still does.

Test plan

• make tests: 3/3 ContentTests specs pass
• make lint: lintKotlin + detekt clean
• make uberjar: builds build/libs/server.jar; java -jar starts in ~2s and /, /content/python, /content/java, /content/kotlin all return 200 with no exceptions logged
• make versions prints All dependencies are up to date; make versions-all writes the full report
• ./gradlew --version reports Gradle 9.8.1; configuration cache entry stored then reused
• CI passes

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