Temporarily pin cf cli version to 8.8.3

CF cli have created a new tag
[`v8.9.0`](https://github.com/cloudfoundry/cli/releases/tag/v8.9.0) but
have not attached the cli binaries to it. Therefore, fetching latest cli
fails with `HTTP 404` error, e.g. see
https://ci.korifi.cf-app.com/teams/main/pipelines/main/jobs/run-e2es-eks-periodic/builds/11159

To mitigate this, we pin the cli version to the previous release until
the issue is solved on the cli side.

Co-authored-by: Danail Branekov <danailster@gmail.com>

Makefile

@@ -109,7 +109,7 @@ bin/golangci-lint:
 
 bin/cf:
 	mkdir -p $(GOBIN)
-	curl -fsSL "https://packages.cloudfoundry.org/stable?release=linux64-binary&version=v8&source=github" \
+	curl -fsSL "https://packages.cloudfoundry.org/stable?release=linux64-binary&version=8.8.3&source=github-rel" \
 	  | tar -zx cf8 \
 	  && mv cf8 $(GOBIN)/cf \
 	  && chmod +x $(GOBIN)/cf