fix: webui/Dockerfile to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-DEBIAN12-AOM-7197979
- https://snyk.io/vuln/SNYK-DEBIAN12-EXPAT-7855502
- https://snyk.io/vuln/SNYK-DEBIAN12-EXPAT-7855503
- https://snyk.io/vuln/SNYK-DEBIAN12-EXPAT-7855507
- https://snyk.io/vuln/SNYK-DEBIAN12-GIT-6846203

webui/Dockerfile

@@ -1,4 +1,4 @@
-FROM node:20.14
+FROM node:20.18
 # Current Active LTS release according to (https://nodejs.org/en/about/releases/)
 
 ENV WEBUI_DIR /src/webui