[22497] Bump version to v4.0.3

[MiguelCompany]

Description

Merge after updating other repos:
3.1.x:

• [22497] Regenerate types with Fast DDS Gen 4.0.3 Fast-DDS#5502
• [22497] Regenerate types with Fast DDS Gen 4.0.3 Fast-DDS-docs#991
• [22497] Regenerate types with Fast DDS Gen v4.0.3 ShapesDemo#192
• Discovery Server: N/A
• Statistics backend: N/A
• Fast DDS python: N/A

master:

• [22497] Regenerate types with Fast DDS Gen 4.0.3 Fast-DDS#5503
• [22497] Regenerate types with Fast DDS Gen 4.0.3 Fast-DDS-docs#992
• [22497] Regenerate types with Fast DDS Gen v4.0.3 ShapesDemo#193
• [22497] Update types with Fast DDS Gen 4.0.3 Discovery-Server#111
• [22497] Update types with Fast DDS Gen v4.0.3 Fast-DDS-statistics-backend#261
• [22497] Regenerate types with Fast DDS Gen 4.0.3 Fast-DDS-python#202

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.
• N/A: Check CI results: changes do not issue any warning.
• N/A: Check CI results: failing tests are unrelated with the changes.

[EugenioCollado]

LGTM