guardian: bump Node.js from 24 to 26 (#18375)

* guardian: bump Node.js from 24 to 26

* Set NODE_VERSION to 26 before updating Guardian

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Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: CanbiZ (MickLesk) <47820557+MickLesk@users.noreply.github.com>

ct/guardian.sh

@@ -53,6 +53,8 @@ function update_script() {
       msg_ok "Restored Database"
     fi
 
+    NODE_VERSION="26" setup_nodejs
+
     msg_info "Updating Guardian"
     cd /opt/guardian/backend
     $STD npm ci

install/guardian-install.sh

@@ -17,7 +17,7 @@ msg_info "Installing Dependencies"
 $STD apt install -y sqlite3
 msg_ok "Installed Dependencies"
 
-NODE_VERSION="24" setup_nodejs
+NODE_VERSION="26" setup_nodejs
 fetch_and_deploy_gh_release "guardian" "HydroshieldMKII/Guardian" "tarball" "latest" "/opt/guardian"
 
 msg_info "Configuring ${APPLICATION}"