⬆️(ci) upgrade GitHub Actions workflow steps to latest versions

Update all GitHub Actions to their latest major versions for improved
performance, security patches, and Node.js runtime compatibility.

Signed-off-by: Stephan Meijer <me@stephanmeijer.com>

.github/workflows/docker-hub.yml

@@ -23,7 +23,7 @@ jobs:
     steps:
       -
         name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       -
         name: Docker meta
         id: meta
@@ -59,7 +59,7 @@ jobs:
     steps:
       -
         name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       -
         name: Docker meta
         id: meta
@@ -96,7 +96,7 @@ jobs:
     steps:
       -
         name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       -
         name: Docker meta
         id: meta
@@ -133,7 +133,7 @@ jobs:
     steps:
       -
         name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       -
         name: Docker meta
         id: meta
@@ -172,7 +172,7 @@ jobs:
     steps:
       -
         name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
       -
         name: Docker meta
         id: meta