redisson-spring-boot-starter 4.6.1: consider removing redundant BOM imports already managed by spring-boot-dependencies

## Description

When consuming `redisson-spring-boot-starter:4.6.1` alongside `spring-boot-starter-parent` (Spring Boot 4.1.0), Maven emits a large number of warnings during dependency collection, for example:

```
Ignored POM import for: org.junit.jupiter:junit-jupiter:jar:6.0.1@compile as already imported org.junit.jupiter:junit-jupiter:jar:6.0.3@compile.
Ignored POM import for: com.fasterxml.jackson.core:jackson-core:jar:2.21.3@compile as already imported com.fasterxml.jackson.core:jackson-core:jar:2.21.4@compile.
```

## Root Cause

The `redisson-spring-boot-starter` POM's `<dependencyManagement>` section imports:
- `spring-boot-dependencies:4.1.0` — which already manages `junit-bom:6.0.3` and Jackson `2.21.4`
- `junit-bom:6.0.1` — explicitly, which is an older version than what `spring-boot-dependencies` already brings in

Since `spring-boot-dependencies` is imported first (either via the starter's own POM or the user's parent), Maven ignores the later conflicting BOM imports and emits warnings for each managed artifact.

## Suggestion

You may want to consider removing the explicit `junit-bom` import from `redisson-spring-boot-starter`'s `dependencyManagement`, since both JUnit and Jackson are already managed by `spring-boot-dependencies` which is imported in the same POM. This would eliminate the warnings for users who inherit from `spring-boot-starter-parent`.

## Environment

- `redisson-spring-boot-starter`: 4.6.1
- Spring Boot: 4.1.0

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