Upgrade pytest-rerunfailures

To avoid error:

i  File "/usr/lib/python3.9/site-packages/setuptools/_vendor/typeguard/_pytest_plugin.py", line 53, in pytest_addoption
    add_ini_option("string")
  File "/usr/lib/python3.9/site-packages/setuptools/_vendor/typeguard/_pytest_plugin.py", line 22, in add_ini_option
    parser.addini(
  File "/usr/lib/python3.9/site-packages/_pytest/config/argparsing.py", line 131, in addini
    assert type in (None, "pathlist", "args", "linelist", "bool")
AssertionError

ckan-2.9/Dockerfile

@@ -151,6 +151,9 @@ RUN apk add --no-cache libffi-dev
 # Install CKAN dev requirements
 RUN pip3 install -r https://raw.githubusercontent.com/ckan/ckan/${CKAN_REF}/dev-requirements.txt
 
+# TODO: remove if requirements upgraded upstream
+RUN pip3 install -U pytest-rerunfailures 
+
 # Create folder for local extensions sources
 RUN mkdir -p ${SRC_EXTENSIONS_DIR}