[chore][CI/CD] Fix build-examples (#32156)

**Description:** <Describe what has changed.>
<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
GitHub runners are being upgraded to docker v2. This requires `docker
compose` to be used instead of `docker-compose`. I'm not aware of any
other requirements for updating `build-examples` at this time.

**Link to tracking Issue:** <Issue number if applicable>
Resolves
#32138

**Testing:** <Describe what testing was performed and which tests were
added.>
Working locally, github runners won't run on updated code until merged
into main AFAIK, unfortunately.

Co-authored-by: Antoine Toulme <antoine@lunar-ocean.com>

Makefile

@@ -347,9 +347,9 @@ otel-from-lib:
 
 .PHONY: build-examples
 build-examples:
-	docker-compose -f examples/demo/docker-compose.yaml build
-	cd examples/secure-tracing/certs && $(MAKE) clean && $(MAKE) all && docker-compose -f ../docker-compose.yaml build
-	docker-compose -f exporter/splunkhecexporter/example/docker-compose.yml build
+	docker compose -f examples/demo/docker-compose.yaml build
+	cd examples/secure-tracing/certs && $(MAKE) clean && $(MAKE) all && docker compose -f ../docker-compose.yaml build
+	docker compose -f exporter/splunkhecexporter/example/docker-compose.yml build
 
 .PHONY: deb-rpm-package
 %-package: ARCH ?= amd64