Change supported PyPy versions to 3.9 and 3.10. (#6087)

* Change support PyPy versions to 3.9 and 3.10.

* Update the RTD URL for coverage.

* Move pypy3-pinned back to pypy3.8.

.github/workflows/tests-ubuntu.yml

@@ -30,6 +30,9 @@ jobs:
         - python-version: pypy3.9
           env:
             TOXENV: pypy3
+        - python-version: pypy3.10
+          env:
+            TOXENV: pypy3
 
         # pinned deps
         - python-version: 3.8.17
@@ -69,7 +72,7 @@ jobs:
         python-version: ${{ matrix.python-version }}
 
     - name: Install system libraries
-      if: matrix.python-version == 'pypy3.9' || contains(matrix.env.TOXENV, 'pinned')
+      if: contains(matrix.python-version, 'pypy') || contains(matrix.env.TOXENV, 'pinned')
       run: |
         sudo apt-get update
         sudo apt-get install libxml2-dev libxslt-dev

docs/conf.py

@@ -276,7 +276,7 @@ coverage_ignore_pyobjects = [
 
 intersphinx_mapping = {
     "attrs": ("https://www.attrs.org/en/stable/", None),
-    "coverage": ("https://coverage.readthedocs.io/en/stable", None),
+    "coverage": ("https://coverage.readthedocs.io/en/latest", None),
     "cryptography": ("https://cryptography.io/en/latest/", None),
     "cssselect": ("https://cssselect.readthedocs.io/en/latest", None),
     "itemloaders": ("https://itemloaders.readthedocs.io/en/latest/", None),