Describe the corner case of adding Spine-specific repositories

[alexander-yevsyukov]

This PR updates the documentation describing the case when the user would need to add Spine-specific repositories in dependencyResolutionManagement section of settings.gradle.kts file of his project.

[Copilot]

Pull request overview

This PR updates documentation to clarify when users need to manually add Spine-specific Maven repositories to their Gradle build configuration. The changes explain that manual repository configuration is only required when using centralized repository management with restrictive repositoriesMode settings in settings.gradle.kts.

Changes:

• Added comprehensive documentation explaining the exception case for manual repository configuration
• Updated version numbers across build files from .395 to .396 (and related dependency versions)
• Minor grammar correction in existing documentation text

Reviewed changes

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Show a summary per file

File	Description
docs/content/docs/validation/01-getting-started/adding-to-build.md	Added new section explaining when and how to manually add Spine repositories, with code examples; updated plugin versions; minor grammar fix
version.gradle.kts	Bumped validation version to 2.0.0-SNAPSHOT.396
pom.xml	Updated project and dependency versions
dependencies.md	Updated version references and generation timestamps
buildSrc/src/main/kotlin/io/spine/dependency/local/Validation.kt	Updated Validation version constant
buildSrc/src/main/kotlin/io/spine/dependency/local/ToolBase.kt	Updated ToolBase version constants
buildSrc/src/main/kotlin/io/spine/dependency/local/CoreJvmCompiler.kt	Updated CoreJvmCompiler version constants
docs/_examples	Updated subproject commit reference

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