pin larch<6 for now (#947)

Author: jpn--

.github/workflows/core_tests.yml

@@ -435,7 +435,7 @@ jobs:
         if: steps.cache.outputs.cache-hit != 'true'
 
       - name: Install Larch
-        run: mamba install "larch>=5.7.1"
+        run: mamba install "larch>=5.7.1,<6"
 
       - name: Install activitysim
         # installing without dependencies is faster, we trust that all needed dependencies

conda-environments/docbuild.yml

@@ -23,7 +23,7 @@ dependencies:
 - git
 - jupyter-book
 - jupyterlab
-- larch >=5.5.3
+- larch >=5.5.3,<6
 - matplotlib
 - multimethod <2.0
 - myst-nb