chore(deps): bump the observability-deps group across 1 directory with 4 updates

Updates the requirements on [prometheus-client](https://github.com/prometheus/client_python), [opentelemetry-api](https://github.com/open-telemetry/opentelemetry-python), [opentelemetry-exporter-otlp-proto-grpc](https://github.com/open-telemetry/opentelemetry-python) and [opentelemetry-instrumentation](https://github.com/open-telemetry/opentelemetry-python-contrib) to permit the latest version.

Updates `prometheus-client` from 0.19.0 to 0.25.0
- [Release notes](https://github.com/prometheus/client_python/releases)
- [Commits](prometheus/client_python@v0.19.0...v0.25.0)

Updates `opentelemetry-api` to 1.42.1
- [Release notes](https://github.com/open-telemetry/opentelemetry-python/releases)
- [Changelog](https://github.com/open-telemetry/opentelemetry-python/blob/main/CHANGELOG.md)
- [Commits](open-telemetry/opentelemetry-python@v1.27.0...v1.42.1)

Updates `opentelemetry-exporter-otlp-proto-grpc` to 1.42.1
- [Release notes](https://github.com/open-telemetry/opentelemetry-python/releases)
- [Changelog](https://github.com/open-telemetry/opentelemetry-python/blob/main/CHANGELOG.md)
- [Commits](open-telemetry/opentelemetry-python@v1.27.0...v1.42.1)

Updates `opentelemetry-instrumentation` to 0.63b1
- [Release notes](https://github.com/open-telemetry/opentelemetry-python-contrib/releases)
- [Changelog](https://github.com/open-telemetry/opentelemetry-python-contrib/blob/main/CHANGELOG.md)
- [Commits](https://github.com/open-telemetry/opentelemetry-python-contrib/commits)

---
updated-dependencies:
- dependency-name: opentelemetry-api
  dependency-version: 1.41.1
  dependency-type: direct:production
  dependency-group: observability-deps
- dependency-name: opentelemetry-exporter-otlp-proto-grpc
  dependency-version: 1.41.1
  dependency-type: direct:production
  dependency-group: observability-deps
- dependency-name: opentelemetry-instrumentation
  dependency-version: 0.62b1
  dependency-type: direct:production
  dependency-group: observability-deps
- dependency-name: prometheus-client
  dependency-version: 0.25.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: observability-deps
...

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

Author: dependabot[bot]

requirements-dev.txt

@@ -33,5 +33,5 @@ structlog==23.1.0
 aiohttp==3.9.3
 pydantic==2.6.4
 locust==2.24.0
-prometheus-client==0.19.0
+prometheus-client==0.25.0
 aiohttp-cors==0.7.0

requirements.txt

@@ -22,11 +22,11 @@ pydantic-settings>=2.5.0
 # ---------------------------------------------------------------------------
 # Observability — OpenTelemetry
 # ---------------------------------------------------------------------------
-opentelemetry-api>=1.27.0
+opentelemetry-api>=1.42.1
 opentelemetry-sdk>=1.27.0
 opentelemetry-exporter-otlp>=1.27.0
-opentelemetry-exporter-otlp-proto-grpc>=1.27.0
-opentelemetry-instrumentation>=0.48b0
+opentelemetry-exporter-otlp-proto-grpc>=1.42.1
+opentelemetry-instrumentation>=0.63b1
 
 # ---------------------------------------------------------------------------
 # Cloud Messaging — GCP Pub/Sub (async)