fix: convertPheno_client/Dockerfile to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-ALPINE317-LIBWEBP-5902239
- https://snyk.io/vuln/SNYK-ALPINE317-NGHTTP2-5954769
- https://snyk.io/vuln/SNYK-ALPINE317-CURL-5958910
- https://snyk.io/vuln/SNYK-ALPINE317-EXPAT-7908296
- https://snyk.io/vuln/SNYK-ALPINE317-EXPAT-7908297

convertPheno_client/Dockerfile

@@ -15,7 +15,7 @@ COPY . .
 RUN pnpm run build
 
 #production environment
-FROM nginx:1.23-alpine
+FROM nginx:1.26.2-alpine
 RUN apk add openssl shadow
 RUN apk add --no-cache npm
 RUN npm install -g vite