Bump go.opentelemetry.io/otel from 1.30.0 to 1.31.0 #312

Job	Run time
Test (stable)	32s
Test (oldstable)	33s
Test (otlp, stable)	48s
Test (otlp, oldstable)	50s
Test (gcp, stable)	52s
Test (gcp, oldstable)	53s
Test (grpc, stable)	59s
Test (grpc, oldstable)	56s
Test (examples/grpc, stable)	1m 8s
Test (examples/grpc, oldstable)	1m 3s
Test (http, stable)	50s
Test (http, oldstable)	49s
Test (examples/http, stable)	1m 3s
Test (examples/http, oldstable)	1m 7s
All Tests	1s
	12m 24s

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