bump orca version to 1.3.1

Author: antoinerg

Diff for: .circleci/create_conda_optional_env.sh

@@ -19,5 +19,5 @@ if [ ! -d $HOME/miniconda/envs/circle_optional ]; then
 requests nbformat six retrying psutil pandas decorator pytest mock nose poppler xarray scikit-image ipython jupyter ipykernel ipywidgets
 
     # Install orca into environment
-    $HOME/miniconda/bin/conda install --yes -n circle_optional -c plotly plotly-orca=1.2.1
+    $HOME/miniconda/bin/conda install --yes -n circle_optional -c plotly plotly-orca==1.3.1
 fi

Diff for: README.md

@@ -161,7 +161,7 @@ installation of the plotly [orca](https://github.com/plotly/orca) command line u
 These dependencies can both be installed using conda:
 
 ```
-conda install -c plotly plotly-orca==1.2.1 psutil
+conda install -c plotly plotly-orca==1.3.1 psutil
 ```
 
 Or, `psutil` can be installed using pip...

Diff for: packages/python/plotly/plotly/io/_orca.py

@@ -1429,7 +1429,10 @@ def ensure_server():
                 # specified port.
                 DEVNULL = open(os.devnull, "wb")
                 with orca_env():
-                    orca_state["proc"] = subprocess.Popen(cmd_list, stdout=DEVNULL)
+                    stderr = DEVNULL if "CI" in os.environ else None  # fix for CI
+                    orca_state["proc"] = subprocess.Popen(
+                        cmd_list, stdout=DEVNULL, stderr=stderr
+                    )
 
                 # Update orca.status so the user has an accurate view
                 # of the state of the orca server