Bump golang from 1.25.3-bookworm to 1.25.4-bookworm in /webapp/web (#4632)

Bumps golang from 1.25.3-bookworm to 1.25.4-bookworm.

---
updated-dependencies:
- dependency-name: golang
  dependency-version: 1.25.4-bookworm
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

webapp/web/Dockerfile

@@ -1,6 +1,6 @@
 # Production deployment spec for the webapp.
 
-FROM golang:1.25.3-bookworm as builder
+FROM golang:1.25.4-bookworm as builder
 
 RUN apt-get update
 RUN apt-get install -qy --no-install-suggests git sudo