fix: standard-imghdr is removed from standard library in 3.13 (#705)

* fix: standard-imghdr is removed from standard library in 3.13

* doc: bumped python to 3.13 in readthedocs

* doc: bumped python back to 3.12 in readthedcos

---------

Co-authored-by: mrava87 <matteoravasi@gmail.com>

Author: cako

.readthedocs.yaml

@@ -7,9 +7,9 @@ version: 2
 
 # Set the version of Python and other tools you might need
 build:
-  os: ubuntu-20.04
+  os: ubuntu-24.04
   tools:
-    python: "3.11"
+    python: "3.12"
 
 # Build documentation in the docs/ directory with Sphinx
 sphinx:

requirements-doc.txt

@@ -30,6 +30,7 @@ isort
 black
 flake8
 mypy
+standard-imghdr; python_version >= '3.13'
 pytensor>=2.28.0
 pymc>=5.21.0
 mkl_fft; sys_platform != "darwin"