Add python-flint to one CI config

Author: bjodah

.github/workflows/ci.yml

@@ -132,11 +132,12 @@ jobs:
             CC: gcc
 
           - BUILD_TYPE: Release
-            PYTHON_VERSION: '3.8'
+            PYTHON_VERSION: '3.11'
             OS: ubuntu-20.04
             WITH_MPC: yes
             WITH_MPFR: yes
             WITH_FLINT: yes
+            WITH_FLINT_PY: yes
             WITH_SCIPY: yes
             WITH_DOCS: yes
             INTEGER_CLASS: flint

bin/install_travis.sh

@@ -16,6 +16,10 @@ if [[ "${WITH_DOCS}" == "yes" ]]; then
     export conda_pkgs="${conda_pkgs} sphinx recommonmark";
 fi
 
+if [[ "${WITH_FLINT_PY}" == "yes" ]]; then
+    export conda_pkgs="${conda_pkgs} python-flint";  # python-flint affects sympy, see e.g. sympy/sympy#26645
+fi
+
 if [[ "${WITH_SAGE}" == "yes" ]]; then
     # This is split to avoid the 10 minute limit
     conda install -q sagelib=8.1