fix doc builds (#919)

* fix errors

* update scipy dep

* build with python 3.10

doc/rtd_environment.yml

@@ -2,17 +2,18 @@ channels:
   - conda-forge
   - defaults
 dependencies:
-  - python=3.9
+  - python=3.10
   - setuptools_scm
   # weldx base dependencies
   - numpy>=1.18
   - pandas>=1.0
   - xarray>=0.15
   - pint>=0.11
-  - scipy>=1.6.2
+  - scipy>=1.6.2,<1.12
   - sympy>=1.6
-  - asdf>=2.8
+  - asdf>=2.8,<3
   - bottleneck>=1.3
+  - matplotlib<3.8
   # notebook execution
   - myst-nb
   - ipykernel
@@ -24,7 +25,7 @@ dependencies:
   - urllib3<2
   #- jinja2=3.0
   - sphinx-copybutton
-  - pydata-sphinx-theme
+  - pydata-sphinx-theme<0.15 # parallel-write-unsafe
   - numpydoc>=0.5
   - sphinx-autodoc-typehints>=1.21.8
   - typing_extensions