Make more DeMuon methods const

This is to match in DeMuon the changes introduced in LHCb!3636 (merged) and required for Boole!389 (merged).

Detector/Muon/include/Detector/Muon/DeMuon.h

@@ -173,7 +173,7 @@ namespace LHCb::Detector {
     std::optional<TilePosition> position( Muon::TileID ) const { throw NotImplemented(); }
 
     void        CountDetEls() { throw NotImplemented(); }
-    std::string getStationName( int ) { throw NotImplemented(); }
+    std::string getStationName( int ) const { throw NotImplemented(); }
 
     int          gapsInRegion( const int, const int ) const { throw NotImplemented(); }
     int          gapsPerFE( const int, const int ) const { throw NotImplemented(); }
@@ -215,10 +215,10 @@ namespace LHCb::Detector {
 
     // Returns the list of physical channels for a given chamber
     std::vector<std::pair<Muon::FrontEndID, std::array<float, 4>>>
-    listOfPhysChannels( ROOT::Math::XYZPoint, ROOT::Math::XYZPoint, int, int ) {
+    listOfPhysChannels( ROOT::Math::XYZPoint, ROOT::Math::XYZPoint, int, int ) const {
       throw NotImplemented();
     }
-    std::optional<ROOT::Math::XYZPoint> getPCCenter( Muon::FrontEndID, int, int, int ) { throw NotImplemented(); }
+    std::optional<ROOT::Math::XYZPoint> getPCCenter( Muon::FrontEndID, int, int, int ) const { throw NotImplemented(); }
 
     Muon::DAQHelper*       getDAQInfo() { return &this->access()->m_daq; }
     const Muon::DAQHelper* getDAQInfo() const { return &this->access()->m_daq; }