Update versions in github workflow to the last compatible version (#347)

Signed-off-by: elianalf <62831776+elianalf@users.noreply.github.com>

Author: elianalf

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

@@ -32,7 +32,7 @@ on:
         required: true
         type: string
       fastdds_fallback_branch:
-        description: 'Fast DDS fallback branch in case `fastdds_branch` does not exist (e.g. master or 3.0.x-devel)'
+        description: 'Fast DDS fallback branch in case `fastdds_branch` does not exist (e.g. master or a previous version)'
         required: false
         type: string
 

.github/workflows/ubuntu-ci.yaml

@@ -49,6 +49,6 @@ jobs:
       foonathan_memory_vendor_branch: ${{ inputs.foonathan_memory_vendor_branch || 'master' }}
       fastcdr_branch: ${{ matrix.fastcdr_version }}
       fastdds_branch: ${{ inputs.fastdds_branch || github.head_ref }}
-      fastdds_python_branch: ${{ inputs.fastdds_python_branch || 'main' }}
-      fastddsgen_branch: ${{ inputs.fastddsgen_branch || github.ref || 'master' }}
-      fastdds_fallback_branch: ${{ 'master' }}
+      fastdds_python_branch: ${{ inputs.fastdds_python_branch || '1.4.x' }}
+      fastddsgen_branch: ${{ inputs.fastddsgen_branch || github.ref || '3.3.x' }}
+      fastdds_fallback_branch: ${{ '2.14.x' }}