Bump alpine from 3.18 to 3.19 in /cmd/otel-allocator (#2429)

Bumps alpine from 3.18 to 3.19.

---
updated-dependencies:
- dependency-name: alpine
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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cmd/otel-allocator/Dockerfile

@@ -1,5 +1,5 @@
 # Get CA certificates from the Alpine package repo
-FROM alpine:3.18 as certificates
+FROM alpine:3.19 as certificates
 
 RUN apk --no-cache add ca-certificates