Bump actions/checkout from 3 to 4 (#279)

.github/workflows/build.yml

@@ -19,7 +19,7 @@ jobs:
     name: black
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: actions/setup-python@v4
       with:
         python-version: '3.11'
@@ -32,7 +32,7 @@ jobs:
     name: flake8
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: actions/setup-python@v4
       with:
         python-version: '3.11'
@@ -45,7 +45,7 @@ jobs:
     name: isort
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: actions/setup-python@v4
       with:
         python-version: '3.11'
@@ -58,7 +58,7 @@ jobs:
     name: mypy
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: actions/setup-python@v4
       with:
         python-version: '3.11'
@@ -79,7 +79,7 @@ jobs:
         sidx-version: ['1.8.5','1.9.3']
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: conda-incubator/setup-miniconda@v2
       with:
         channels: conda-forge
@@ -107,7 +107,7 @@ jobs:
         python-version: ['3.8', '3.9', '3.10', '3.11']
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - uses: actions/setup-python@v4
       name: Install Python
       with:
@@ -135,7 +135,7 @@ jobs:
       matrix:
         os: [windows-latest, ubuntu-latest, macos-latest]
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up QEMU
       if: runner.os == 'Linux'
       uses: docker/setup-qemu-action@v2
@@ -170,7 +170,7 @@ jobs:
       fail-fast: true
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-python@v4
         name: Install Python
         with: