[PWGUD] Update FwdMuonsUPC (#16307)

Co-authored-by: ALICE Action Bot <alibuild@cern.ch>

Author: ariffero

PWGUD/Tasks/CMakeLists.txt

@@ -200,7 +200,7 @@ o2physics_add_dpl_workflow(upc-pion-analysis
                            COMPONENT_NAME Analysis)
 
 o2physics_add_dpl_workflow(fwd-muons-upc
-                           SOURCES FwdMuonsUPC.cxx
+                           SOURCES fwdMuonsUpc.cxx
                            PUBLIC_LINK_LIBRARIES O2::Framework O2Physics::AnalysisCore O2Physics::DGPIDSelector
                            COMPONENT_NAME Analysis)