Use the old doc requirements

doc/requirements.txt

@@ -1,14 +1,16 @@
-numpy==1.26.4
-scipy==1.14.1
-qutip==5.0.3.post1
+numpy==1.22.4
+scipy==1.10.0
+qutip==5.0.1
 qutip-qtrl==0.1.3
-cython==3.0.11
-sphinx==7.4.7
-sphinx_rtd_theme==2.0.0
-readthedocs-sphinx-search==0.3.2
-numpydoc==1.8.0
-matplotlib==3.9.2
-docutils==0.20.1
-sphinxcontrib-bibtex==2.6.2
-qiskit==0.46.2
-qiskit-aer==0.14.2
+cython==0.29.30
+sphinx==5.0.2
+sphinx_rtd_theme==1.0.0
+readthedocs-sphinx-search==0.1.2
+numpydoc==1.4.0
+matplotlib==3.5.2
+docutils==0.17.1
+sphinxcontrib-bibtex==2.4.2
+pyqir-generator==0.6.2
+pyqir-parser==0.6.2
+qiskit==0.46.1
+qiskit-aer==0.14.0.1