Update base image and fix nfsv2 (#9)

* Remove references to NFSv2

* Update to new alpine version (Dockerfile base)

Author: obeone

Dockerfile

@@ -1,4 +1,4 @@
-ARG BUILD_FROM=alpine:3.17
+ARG BUILD_FROM=alpine:3.18
 
 FROM $BUILD_FROM
 

entrypoint.sh

@@ -534,7 +534,7 @@ boot_helper_mount() {
 boot_helper_get_version_flags() {
 
   local -r requested_version="${state[$STATE_NFS_VERSION]}"
-  local flags=('--nfs-version' "$requested_version" '--no-nfs-version' 2)
+  local flags=('--nfs-version' "$requested_version")
 
   if ! is_nfs3_enabled; then
     flags+=('--no-nfs-version' 3)