Add pin for last version of importlib-resources that works on Python …

…2. (#1018)

The previous commit updated tqdm to 4.63.0, which has importlib-resources as new requirement.
This was not pinned yet.
So Plone coredev 5.2 locally failed on Python 2.7 with the latest Zope 4.x dev versions.

Also added pin for singledispatch, which is required by importlib-resources.
Latest version seems fine.

versions.cfg

@@ -52,6 +52,8 @@ idna = 2.10
 imagesize = 1.3.0
 # tox and pluggy require importlib-metadata <1
 importlib-metadata = 0.23
+# tqdm 4.63+ requires importlib-resources, and 3.3.1 is the last that works on Python 2.
+importlib-resources = 3.3.1
 lxml = 4.8.0
 manuel = 1.10.1
 # Version 6+ needs Python 3.x
@@ -79,6 +81,7 @@ readme-renderer = 28.0
 requests = 2.27.1
 requests-toolbelt = 0.9.1
 scandir = 1.10.0
+singledispatch = 3.7.0
 snowballstemmer = 2.2.0
 # soupsieve 2 needs Python 3
 soupsieve = 1.9.6