fix(infra): correct OTel collector image tag

`otel/opentelemetry-collector-contrib:0.115.0` does not exist on
Docker Hub — release 0.115 was published as `0.115.1` only (the
`.0` patch was either yanked or never built). Like the Jaeger
mistake in #58, I picked it from memory in #57 without
verification:

    Error response from daemon: failed to resolve reference
    "docker.io/otel/opentelemetry-collector-contrib:0.115.0":
    not found

Pin to `0.150.1`, the most recent stable patch. The collector
promises backward-compat for stable features (otlp receiver,
batch processor, debug exporter, otlp exporter), so our
`otel-collector.yaml` keeps working as-is. Renovate's
docker-compose manager will surface future bumps automatically.

Postgres / Redis / pgweb tags were verified against Docker Hub at
the same time; they are correct.

infra/local/dev.compose.yml

@@ -80,7 +80,7 @@ services:
       retries: 5
 
   otel-collector:
-    image: otel/opentelemetry-collector-contrib:0.115.0
+    image: otel/opentelemetry-collector-contrib:0.150.1
     container_name: apf-portal-otel-collector
     restart: unless-stopped
     command: ['--config=/etc/otel-collector.yaml']