Use specified version of server and python

Signed-off-by: Manuel Valch <[email protected]>

Author: manuelValch

.github/workflows/reusable-ubuntu-ci.yml

@@ -147,14 +147,14 @@ jobs:
         uses: eProsima/eProsima-CI/ubuntu/get_related_branch_from_repo@v0
         with:
           remote_repository: eProsima/Fast-DDS-python
-          fallback_branch: main
+          fallback_branch: ${{ inputs.fastdds-python-branch }}
 
       - name: Get Discovery Server branch
         id: get_discovery_server_branch
         uses: eProsima/eProsima-CI/ubuntu/get_related_branch_from_repo@v0
         with:
           remote_repository: eProsima/Discovery-Server
-          fallback_branch: master
+          fallback_branch: ${{ inputs.discovery-server-branch }}
 
       - name: Download Fast CDR, Fast DDS Python, and Discovery Server
         run: |