Pin docs requirements

Author: samdoran

docs/requirements.in

@@ -0,0 +1,5 @@
+ansible-core
+pbr
+pexpect
+six
+sphinx

docs/requirements.txt

@@ -1,3 +1,33 @@
-pbr
-sphinx
-ansible-core
+alabaster==0.7.12
+ansible-core==2.11.6
+Babel==2.9.1
+certifi==2021.10.8
+cffi==1.15.0
+charset-normalizer==2.0.7
+cryptography==35.0.0
+docutils==0.17.1
+idna==3.3
+imagesize==1.2.0
+Jinja2==3.0.2
+MarkupSafe==2.0.1
+packaging==21.0
+pbr==5.6.0
+pexpect==4.8.0
+ptyprocess==0.7.0
+pycparser==2.20
+Pygments==2.10.0
+pyparsing==3.0.1
+pytz==2021.3
+PyYAML==6.0
+requests==2.26.0
+resolvelib==0.5.5
+six==1.16.0
+snowballstemmer==2.1.0
+Sphinx==4.2.0
+sphinxcontrib-applehelp==1.0.2
+sphinxcontrib-devhelp==1.0.2
+sphinxcontrib-htmlhelp==2.0.0
+sphinxcontrib-jsmath==1.0.1
+sphinxcontrib-qthelp==1.0.3
+sphinxcontrib-serializinghtml==1.1.5
+urllib3==1.26.7