Bound MyST NB to fix the compressed images (#660)

* Update requirements-docs.txt

* Update requirements-docs.txt

Co-authored-by: Oriol Abril-Pla <[email protected]>

---------

Co-authored-by: Oriol Abril-Pla <[email protected]>

Author: juanitorduz

requirements-docs.txt

@@ -1,6 +1,6 @@
 ablog>=0.11
 matplotlib
-myst-nb
+myst-nb!=1.1
 sphinx-codeautolink
 sphinx>=5
 pymc-sphinx-theme==0.14