fix: disable workspace default feature #4309

Job	Run time
cargo-deny	26s
cargo-deny	26s
docs	3m 34s
docs	3m 34s
lint	3m 49s
lint	3m 49s
msrv	4m 30s
msrv	4m 30s
test (stable)	7m 4s
test (stable)	7m 4s
test (beta)	7m 41s
test (beta)	7m 41s
non-default-examples (opentelemetry-otlp/examples/basic-otlp)	1m 8s
non-default-examples (opentelemetry-otlp/examples/basic-otlp)	1m 8s
coverage	3m 13s
coverage	3m 22s
external-types (opentelemetry)	3m 0s
external-types (opentelemetry)	3m 0s
external-types (opentelemetry-sdk)	1m 13s
external-types (opentelemetry-sdk)	1m 13s
	1h 11m 25s

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