Bump signalfx/splunk-otel-collector

Bumps signalfx/splunk-otel-collector from 0.86.0 to 0.87.0.

---
updated-dependencies:
- dependency-name: signalfx/splunk-otel-collector
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

examples/prometheusexec-migration/Dockerfile

@@ -1,3 +1,3 @@
-FROM quay.io/signalfx/splunk-otel-collector:0.86.0
+FROM quay.io/signalfx/splunk-otel-collector:0.87.0
 COPY --from=quay.io/prometheus/node-exporter:v1.6.1 --chown=999 /bin/node_exporter /usr/bin/node_exporter
 CMD ["otelcol"]