DynamicMatrix has a bug which invalidates eigenmodes experiment

Branch: develop

File: experiments/eigen/dynamic_matrix.py

Function: InverseDynamicMatrix._matvec() (line 192)

Issue: function execution is interrupted by error: inexpected keyword argument for lgmres(): tol

Cause: usage of tol keyword argument https://codebase.helmholtz.cloud/micromagnetic-modeling/tetrax/-/blob/develop/tetrax/experiments/eigen/dynamic_matrix.py?ref_type=heads#L199

Suggested fix: at line 199, replace tol=self.tol, with rtol=self.tol,