Update actions to v3

Author: pbashyal-nmdp

.github/workflows/black.yml

@@ -6,5 +6,5 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: psf/black@stable

.github/workflows/post-release.yml

@@ -8,10 +8,10 @@ jobs:
     name: Update changelog
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with:
           ref: master
-      - uses: rhysd/changelog-from-release/action@v2
+      - uses: rhysd/changelog-from-release/action@v3
         with:
           file: CHANGELOG.md
           github_token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/python-tests.yml

@@ -15,9 +15,9 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Set up Python 3.8
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v3
       with:
         python-version: 3.8
     - name: Install dependencies

.github/workflows/pythonpublish.yml

@@ -13,11 +13,11 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Set up Python
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@v3
       with:
-        python-version: '3.x'
+        python-version: 3.8
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip