Update actions/checkout action to v3

Author: renovate-bot

.github/workflows/featureRelease.yml

@@ -16,7 +16,7 @@ jobs:
     steps:
       -
         name: Set up Project
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       -
         name: Build Filehandler
         run: |

.github/workflows/latestRelease.yml

@@ -16,7 +16,7 @@ jobs:
     steps:
       -
         name: Set up Project
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       -
         name: Build Filehandler
         run: |

.github/workflows/stableRelease.yml

@@ -11,7 +11,7 @@ jobs:
     steps:
       -
         name: Set up Project
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       -
         name: Build Filehandler
         run: |