Merge branch 'master' into importlib_metadata

Author: nocarryr

.github/workflows/ci.yml

@@ -9,15 +9,15 @@ on:
 jobs:
   test:
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     strategy:
       matrix:
         python-version: [3.6, 3.7, 3.8, 3.9]
 
     steps:
     - 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 }}
     - name: Install base dependencies

.github/workflows/dist-test.yml

@@ -47,7 +47,7 @@ jobs:
 
   test:
     needs: build
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     strategy:
       matrix:
         python-version: [3.6, 3.7, 3.8, 3.9]
@@ -57,7 +57,7 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies

doc/requirements.txt

@@ -1,4 +1,4 @@
-Sphinx
+Sphinx==4.5.0
 sphinx_rtd_theme
 m2r2
 furo

sphinx-plugin/requirements-dev.txt

@@ -1,2 +1,2 @@
-sphinx>=4.5
+sphinx==4.5.0
 sphinx-rst-builder