OpenFOAM: Updated for gcc-13

gcc-13 has new code checking and warning mechanisms which are useful but not
entirely robust and produce many false positives, particularly with respect to
local references:

    warning: possibly dangling reference to a temporary

This commit resolves many of the new warning messages but the above false
warnings remain.  It is possible to switch off this warning but as it also
provides some useful checks it is currently left on.

src/functionObjects/forces/forces/forces.C

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     | Website:  https://openfoam.org
-    \\  /    A nd           | Copyright (C) 2011-2021 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2023 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -71,7 +71,7 @@ Foam::wordList Foam::functionObjects::forces::createFileNames
         }
     }
 
-    return move(names);
+    return names;
 }