chore(deps): bump nginx from 1.21-alpine to 1.21.3-alpine (#7585)

Bumps nginx from 1.21-alpine to 1.21.3-alpine.

---
updated-dependencies:
- dependency-name: nginx
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Vladimir Gorej <vladimir.gorej@gmail.com>

Dockerfile

@@ -2,7 +2,7 @@
 # We don't declare them here — take a look at our docs.
 # https://github.com/swagger-api/swagger-ui/blob/master/docs/usage/configuration.md
 
-FROM nginx:1.21-alpine
+FROM nginx:1.21.3-alpine
 
 RUN apk update && apk add --no-cache "nodejs>=14.17.6-r0"