Downgrade 'sphinx-book-theme' package version

Due to missing 3.3.0 version in Rocky Linux 8 and openSUSE-leap 15

Author: lukaszstolarczuk

third_party/requirements.txt

@@ -28,7 +28,7 @@ six==1.13.0
 snowballstemmer==2.0.0
 soupsieve==1.9.5
 Sphinx==4.5.0
-sphinx-book-theme==0.3.3
+sphinx-book-theme==0.2.0
 sphinxcontrib-applehelp==1.0.2
 sphinxcontrib-devhelp==1.0.2
 sphinxcontrib-htmlhelp==2.0.0