feat: Prepare for 5.1.0

[afranken]

Description

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[Copilot]

Pull request overview

Prepares the repository for the upcoming 5.1.0 development/release cycle by bumping Maven parent versions across modules and rolling the changelog forward (moving the planned section to the next minor version).

Changes:

• Bump project/module parent versions from 5.0.1-SNAPSHOT to 5.1.0-SNAPSHOT.
• Update CHANGELOG.md to add a new 5.2.0 - PLANNED section and list 5.1.0 as the current version entry.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
pom.xml	Updates root project version to 5.1.0-SNAPSHOT.
server/pom.xml	Aligns server module parent version with 5.1.0-SNAPSHOT.
docker/pom.xml	Aligns docker module parent version with 5.1.0-SNAPSHOT.
integration-tests/pom.xml	Aligns integration-tests module parent version with 5.1.0-SNAPSHOT.
testsupport/pom.xml	Aligns testsupport reactor parent version with 5.1.0-SNAPSHOT.
testsupport/common/pom.xml	Aligns testsupport-common parent version with 5.1.0-SNAPSHOT.
testsupport/junit5/pom.xml	Aligns junit5 testsupport parent version with 5.1.0-SNAPSHOT.
testsupport/testng/pom.xml	Aligns testng testsupport parent version with 5.1.0-SNAPSHOT.
testsupport/testcontainers/pom.xml	Aligns testcontainers testsupport parent version with 5.1.0-SNAPSHOT.
CHANGELOG.md	Rolls planned version forward to 5.2.0 and lists 5.1.0 as the current entry.

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