Update year in footer; update GHA versions

Author: pgleeson

.github/workflows/non-omv.yml

@@ -15,10 +15,10 @@ jobs:
         python-version: [ 3.7, 3.9 ]
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
 
     - name: Set up Python  ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v4
       with:
         python-version:  ${{ matrix.python-version }}
 

.github/workflows/omv-ci.yml

@@ -21,7 +21,7 @@ jobs:
     - uses: actions/checkout@v3
 
     - name: Set up Python  ${{ matrix.python-version }}
-      uses: actions/setup-python@v3
+      uses: actions/setup-python@v4
       with:
         python-version:  ${{ matrix.python-version }}
 

Tutorial/conf.py

@@ -49,7 +49,7 @@
 
 # General information about the project.
 project = u'Hodgkin Huxley Tutorial'
-copyright = u'2014-2022, Joe Bowen & OpenWorm project'
+copyright = u'2014-2023, Joe Bowen & OpenWorm project'
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the