Bump actions/checkout from 3 to 4 (#41)

.github/workflows/documentation.yml

@@ -10,7 +10,7 @@ jobs:
     name: Docker Hub Description
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - uses: peter-evans/dockerhub-description@v3 # Action page: <https://github.com/peter-evans/dockerhub-description>
         with:

.github/workflows/release.yml

@@ -9,7 +9,7 @@ jobs:
     name: Build docker image
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - {uses: gacts/github-slug@v1, id: slug}
 

.github/workflows/tests.yml

@@ -15,7 +15,7 @@ jobs: # Docs: <https://git.io/JvxXE>
     name: Gitleaks
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with: {fetch-depth: 0}
 
       - uses: gacts/gitleaks@v1
@@ -24,7 +24,7 @@ jobs: # Docs: <https://git.io/JvxXE>
     name: Build docker image
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Build docker image
         run: docker build -f ./Dockerfile --tag 3proxy:local .