trimesh should now work without lxml

.conda/meta.yaml

@@ -39,5 +39,5 @@ requirements:
   run_constrained:
     - indexed_gzip >=0.6.1,<1
     - wxpython >=3.0.2.0,<4.1
-    - trimesh 2.*
+    - trimesh >=2.22.28,<3
     - rtree 0.8

requirements-extra.txt

 indexed_gzip>=0.7.0,<1
 wxpython>=3.0.2.0,<4.1
-trimesh==2.*
+trimesh>=2.22.28,<3
 rtree==0.8
-lxml==4.*