Tests: adapt HTML escaping to pygments v2.21.0 change-in-behaviour (#14611)

tests/test_builders/test_build_html_code.py

@@ -45,6 +45,11 @@ def test_html_code_role(app: SphinxTestApp) -> None:
     else:
         sp = ' '
 
+    if tuple(map(int, pygments.__version__.split('.')[:2])) >= (2, 21):
+        abc = '"abc"'
+    else:
+        abc = '"abc"'
+
     app.build()
     content = (app.outdir / 'index.html').read_text(encoding='utf8')
 
@@ -57,7 +62,7 @@ def test_html_code_role(app: SphinxTestApp) -> None:
         '<span class="o">+</span> '
         '<span class="kc">None</span> '
         '<span class="o">+</span> '
-        '<span class="s2">&quot;abc&quot;</span>'
+        f'<span class="s2">{abc}</span>'
         '<span class="p">):</span> '
         '<span class="k">pass</span>'
     )