[2.2.x] Fixed crash building HTML docs since Sphinx 4.3.

See sphinx-doc/sphinx@dd2ff3e.
Backport of f0480dd from main

docs/_ext/djangodocs.py

@@ -8,7 +8,7 @@
 from docutils import nodes
 from docutils.parsers.rst import Directive
 from docutils.statemachine import ViewList
-from sphinx import addnodes
+from sphinx import addnodes, version_info as sphinx_version
 from sphinx.builders.html import StandaloneHTMLBuilder
 from sphinx.directives.code import CodeBlock
 from sphinx.domains.std import Cmdoption
@@ -114,11 +114,17 @@ class DjangoHTMLTranslator(HTMLTranslator):
     def visit_table(self, node):
         self.context.append(self.compact_p)
         self.compact_p = True
-        self._table_row_index = 0  # Needed by Sphinx
+        # Needed by Sphinx.
+        if sphinx_version >= (4, 3):
+            self._table_row_indices.append(0)
+        else:
+            self._table_row_index = 0
         self.body.append(self.starttag(node, 'table', CLASS='docutils'))
 
     def depart_table(self, node):
         self.compact_p = self.context.pop()
+        if sphinx_version >= (4, 3):
+            self._table_row_indices.pop()
         self.body.append('</table>\n')
 
     def visit_desc_parameterlist(self, node):