Bump actions/checkout from 2 to 3 (#147)

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 3.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...v3)

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

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

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

Author: dependabot[bot]

.github/workflows/benchpr.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: windows-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Setup .NET Core
       uses: actions/setup-dotnet@v2
       with:
@@ -22,7 +22,7 @@ jobs:
     - name: Build
       run: dotnet build --configuration Release --no-restore
     - name: Clone splitasm repo
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
       with:
         repository: bitfaster/splitasm
         path: splitasm

.github/workflows/codeql-analysis.yml

@@ -38,7 +38,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL

.github/workflows/gate.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: windows-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Setup .NET Core
       uses: actions/setup-dotnet@v2
       with:

.github/workflows/mac-gate.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: macos-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Setup .NET Core
       uses: actions/setup-dotnet@v2
       with: