Update 3.2.x to be a supported branch (#5854)

* Refs #23269: Update workflows

Signed-off-by: Mario Dominguez <[email protected]>

* Refs #23269: Update README.md

Signed-off-by: Mario Dominguez <[email protected]>

* Refs #23269: Update fastdds.repos

Signed-off-by: Mario Dominguez <[email protected]>

---------

Signed-off-by: Mario Dominguez <[email protected]>

Author: Mario-DL

.github/workflows/mac-ci.yml

@@ -53,5 +53,5 @@ jobs:
       colcon-args: ${{ inputs.colcon-args }}
       cmake-args: '-DSECURITY=ON ${{ inputs.cmake-args }} -DTHIRDPARTY_Asio=FORCE'
       ctest-args: ${{ inputs.ctest-args }}
-      fastdds-branch: ${{ inputs.fastdds_branch || github.ref || 'master' }}
+      fastdds-branch: ${{ inputs.fastdds_branch || github.ref || '3.2.x' }}
       use-ccache: ${{ ((inputs.use-ccache == true) && true) || false }}