Update actions/checkout action to v6 (#37)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

[skip ci]

Author: renovate[bot]

.github/workflows/trunk-check.yaml

@@ -17,7 +17,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Trunk Check
         uses: trunk-io/trunk-action@v1

.github/workflows/trunk-upgrade.yaml

@@ -29,7 +29,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           token: ${{ secrets.GH_TOKEN }}
           ref: updates

.github/workflows/winget-update.yaml

@@ -29,7 +29,7 @@ jobs:
 
     steps:
       - name: Checkout master branch
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           token: ${{ secrets.GH_TOKEN }}
           ref: master
@@ -41,7 +41,7 @@ jobs:
           git reset --hard upstream/master
 
       - name: Checkout updates branch
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           token: ${{ secrets.GH_TOKEN }}
           ref: updates