Update templates to add Alpine 3.19 and drop 3.17

Author: jnoordsij

1.20/alpine3.17/Dockerfile renamed to 1.20/alpine3.19/Dockerfile

@@ -162,8 +162,8 @@
     "variants": [
       "bookworm",
       "bullseye",
+      "alpine3.19",
       "alpine3.18",
-      "alpine3.17",
       "windows/windowsservercore-ltsc2022",
       "windows/windowsservercore-1809",
       "windows/nanoserver-ltsc2022",
@@ -554,8 +554,8 @@
     "variants": [
       "bookworm",
       "bullseye",
+      "alpine3.19",
       "alpine3.18",
-      "alpine3.17",
       "windows/windowsservercore-ltsc2022",
       "windows/windowsservercore-1809",
       "windows/nanoserver-ltsc2022",