Add PyTorch 2.3.0 to CI (#1051)

Also, update 2.2.0 to 2.2.2.

.github/workflows/testing.yml

@@ -21,7 +21,7 @@ jobs:
       fail-fast: false  # don't cancel all jobs when one fails
       matrix:
         python_version: ['3.8', '3.9', '3.10', '3.11']
-        torch_version: ['1.13.1+cpu', '2.0.1+cpu', '2.1.2+cpu', '2.2.0+cpu']
+        torch_version: ['2.0.1+cpu', '2.1.2+cpu', '2.2.2+cpu', '2.3.0+cpu']
         os: [ubuntu-latest]
         exclude:
           - python_version: '3.11'

README.rst

@@ -244,10 +244,10 @@ instructions for PyTorch, visit the `PyTorch website
 <http://pytorch.org/>`__. skorch officially supports the last four
 minor PyTorch versions, which currently are:
 
-- 1.13.1
 - 2.0.1
 - 2.1.2
-- 2.2.0
+- 2.2.2
+- 2.3.0
 
 However, that doesn't mean that older versions don't work, just that
 they aren't tested. Since skorch mostly relies on the stable part of

docs/user/installation.rst

@@ -98,10 +98,10 @@ instructions for PyTorch, visit the `PyTorch website
 <http://pytorch.org/>`__. skorch officially supports the last four
 minor PyTorch versions, which currently are:
 
-- 1.13.1
 - 2.0.1
 - 2.1.2
-- 2.2.0
+- 2.2.2
+- 2.3.0
 
 However, that doesn't mean that older versions don't work, just that
 they aren't tested. Since skorch mostly relies on the stable part of