Bump actions/checkout from 2.3.5 to 2.4.0 (#84)

Bumps [actions/checkout](https://github.com/actions/checkout) from 2.3.5 to 2.4.0.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v2.3.5...v2.4.0)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/build.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: windows-2019
     steps:
       - name: Checkout
-        uses: actions/checkout@v2.3.5
+        uses: actions/checkout@v2.4.0
       - name: Install Python
         uses: actions/setup-python@v2.2.2
         with:
@@ -32,7 +32,7 @@ jobs:
     runs-on: windows-2019
     steps:
       - name: Checkout
-        uses: actions/checkout@v2.3.5
+        uses: actions/checkout@v2.4.0
       - name: Install Python
         uses: actions/setup-python@v2.2.2
         with:
@@ -56,7 +56,7 @@ jobs:
     runs-on: ubuntu-18.04
     steps:
      - name: Checkout
-       uses: actions/checkout@v2.3.5
+       uses: actions/checkout@v2.4.0
      - name: Install Python
        uses: actions/setup-python@v2.2.2
        with:
@@ -86,7 +86,7 @@ jobs:
     runs-on: macOS-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2.3.5
+        uses: actions/checkout@v2.4.0
       - name: Install Python
         uses: actions/setup-python@v2.2.2
         with:
@@ -113,7 +113,7 @@ jobs:
     runs-on: ubuntu-18.04
     steps:
      - name: Checkout
-       uses: actions/checkout@v2.3.5
+       uses: actions/checkout@v2.4.0
      - name: Install Python
        uses: actions/setup-python@v2.2.2
        with:

.github/workflows/lint.yml

@@ -25,7 +25,7 @@ jobs:
           - id: isort
             name: Check import order with isort
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.4.0
       - name: Set up Python
         uses: actions/setup-python@v2
         id: python

.github/workflows/release-assets.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: windows-2019
     steps:
       - name: Checkout
-        uses: actions/checkout@v2.3.5
+        uses: actions/checkout@v2.4.0
       - name: Install Python
         uses: actions/setup-python@v2.2.2
         with:
@@ -34,7 +34,7 @@ jobs:
     runs-on: windows-2019
     steps:
       - name: Checkout
-        uses: actions/checkout@v2.3.5
+        uses: actions/checkout@v2.4.0
       - name: Install Python
         uses: actions/setup-python@v2.2.2
         with:
@@ -61,7 +61,7 @@ jobs:
     runs-on: ubuntu-18.04
     steps:
       - name: Checkout
-        uses: actions/checkout@v2.3.5
+        uses: actions/checkout@v2.4.0
       - name: Install Python
         uses: actions/setup-python@v2.2.2
         with:
@@ -94,7 +94,7 @@ jobs:
     runs-on: macOS-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2.3.5
+        uses: actions/checkout@v2.4.0
       - name: Install Python
         uses: actions/setup-python@v2.2.2
         with: