Update requirements.txt

requirements.txt

@@ -1,6 +1,5 @@
-numpy>=1.21.0,<2.0
-gradio>=3.0,<4.0
-pyvista>=0.39,<1.0
-matplotlib>=3.0,<4.0
-git+https://github.com/spacether/pycalculix.git@master
-ansys-mapdl-core>=0.60,<0.70
+gradio
+fenics
+pyvista
+matplotlib
+ansys-mapdl-core