[23520] Prepare for v4.2.0

[MiguelCompany]

Description

Version bump done in #510

Code regeneration PRs:

• [23520] Regenerate types with Fast DDS Gen v4.2.0 Fast-DDS#6071
• [23520] Regenerate types with Fast DDS Gen v4.2.0 Fast-DDS-docs#1142
• [23520] Regenerate types with Fast DDS Gen v4.2.0 Fast-DDS-python#261
• [23520] Regenerate types with Fast DDS Gen v4.2.0 ShapesDemo#218
• [23520] Regenerate types with Fast DDS Gen v4.2.0 Fast-DDS-statistics-backend#289
• [23520] Regenerate types with Fast DDS Gen v4.2.0 Discovery-Server#120

Contributor Checklist

• Commit messages follow the project guidelines.
• N/A: Tests that thoroughly check the new feature have been added/Regression tests checking the bug and its fix have been added; the added tests pass locally
• N/A: New feature has been documented/Current behavior is correctly described in the documentation.
• N/A: Applicable backports have been included in the description.

Reviewer Checklist

• The PR has a milestone assigned.
• The title and description correctly express the PR's purpose.
• Check contributor checklist is correct.
• Check CI results: changes do not issue any warning.
• Check CI results: failing tests are unrelated with the changes.