Fix the versions of sphinx-related dependencies

This corresponds to the packages that were in use so far and
is needed to keep using Sphinx < 5.

Ref. eng/recordflux/RecordFlux/#1510

setup.py

@@ -106,6 +106,12 @@ def run(self) -> None:
             "scapy ==2.4.5",
             "sphinx >=4.5, <5",
             "sphinx-rtd-theme >= 1.1.1, <1.2",
+            "sphinxcontrib-applehelp == 1.0.4",
+            "sphinxcontrib-devhelp == 1.0.2",
+            "sphinxcontrib-devhelp == 1.0.2",
+            "sphinxcontrib-htmlhelp == 2.0.1",
+            "sphinxcontrib-serializinghtml == 1.1.5",
+            "sphinxcontrib-qthelp == 1.0.3",
             "tqdm >=4.61.1, <4.63",
             "types-Pygments >=2.15, <2.16",
         ],