Remove deprecation warnings in tests related to "linear solver's norm" before release 3.7
There are multiple similar warnings in the tests: Use the linear solver's norm.
/dumux/test/porousmediumflow/tracer/2ptracer/main.cc:203:30: required from here /dumux/dumux/nonlinear/newtonsolver.hh:194:40: warning: ‘Dumux::FVAssembler<TypeTag, diffMethod, isImplicit>::Scalar Dumux::FVAssembler<TypeTag, diffMethod, isImplicit>::normOfResidual(Dumux::FVAssembler<TypeTag, diffMethod, isImplicit>::ResidualType&) const [with TypeTag = Dumux::Properties::TTag::TwoPIncompressibleTpfa; Dumux::DiffMethod diffMethod = Dumux::DiffMethod::numeric; bool isImplicit = true; Dumux::FVAssembler<TypeTag, diffMethod, isImplicit>::Scalar = double; Dumux::FVAssembler<TypeTag, diffMethod, isImplicit>::ResidualType = Dune::BlockVector<Dune::FieldVector<double, 2>, std::allocator<Dune::FieldVector<double, 2> > >]’ is deprecated: Use the linear solver's norm. Will be deleted after 3.7 [-Wdeprecated-declarations] 194 | return assembler.normOfResidual(residual); | ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~ In file included from /dumux/test/porousmediumflow/tracer/2ptracer/main.cc:42: /dumux/dumux/assembly/fvassembler.hh:249:12: note: declared here 249 | Scalar normOfResidual(ResidualType& residual) const | ^~~~~~~~~~~~~~