[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.
[pkg] Version 3.25.0rc0
Let's make a release candidate version of CubicWeb 3.25.0 (only for the Python
package), in the hope that some issues that we usually discover after release
will be sorted out before.