[pkg] Restrict yams version to be less than 0.45.0
Because of reader's API changes x and other subtle but hard to debug changes
in appobjects registration in version 0.45.0.
Closes #17065626.
Tutorials
~~~~~~~~~
We present a few tutorials of different levels. The blog building
tutorial introduces one smoothly to the basic concepts.
Then there is a photo gallery construction tutorial which highlights
more advanced concepts such as unit tests, security settings,
migration scripts.
.. toctree::
:maxdepth: 1
base/index
advanced/index
tools/windmill.rst
textreports/index
dataimport/index