fix: Dockerfile to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-ALPINE318-EXPAT-7908292
- https://snyk.io/vuln/SNYK-ALPINE318-EXPAT-7908293
- https://snyk.io/vuln/SNYK-ALPINE318-CURL-7569015
- https://snyk.io/vuln/SNYK-ALPINE318-EXPAT-7908294
- https://snyk.io/vuln/SNYK-ALPINE318-LIBXML2-6245694

Dockerfile

@@ -1,4 +1,4 @@
-FROM nginx:1.25.3-alpine
+FROM nginx:1.26.2-alpine
 COPY dist/hypertrace-ui /usr/share/nginx/html
 COPY conf/default.conf /etc/nginx/conf.d/default.conf
 RUN chmod a+w /var/cache/nginx /var/run