Bump nginx from 1.21.0-alpine to 1.21.1-alpine in /client (#106)

Bumps nginx from 1.21.0-alpine to 1.21.1-alpine.

---
updated-dependencies:
- dependency-name: nginx
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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client/Dockerfile

@@ -10,7 +10,7 @@ COPY . ./
 RUN npm run build
 
 # production environment
-FROM nginx:1.21.0-alpine
+FROM nginx:1.21.1-alpine
 COPY --from=build /app/build /usr/share/nginx/html
 COPY nginx/nginx.conf /etc/nginx/conf.d/default.conf