Update version to 1.31.0.dev/0.52b0.dev #896

Job	Run time
opentelemetry-api	41s
opentelemetry-proto-protobuf5	28s
opentelemetry-sdk	47s
opentelemetry-semantic-conventions	33s
opentelemetry-exporter-opencensus	39s
opentelemetry-exporter-otlp-proto-grpc	41s
opentelemetry-exporter-otlp-proto-common	44s
opentelemetry-exporter-otlp-combined	41s
opentelemetry-exporter-otlp-proto-http	42s
opentelemetry-exporter-prometheus	42s
opentelemetry-exporter-zipkin-combined	44s
opentelemetry-exporter-zipkin-json	43s
opentelemetry-exporter-zipkin-proto-http	39s
opentelemetry-getting-started	59s
opentelemetry-opencensus-shim	42s
opentelemetry-opentracing-shim	43s
opentelemetry-propagator-b3	39s
opentelemetry-propagator-jaeger	35s
opentelemetry-test-utils	36s
	12m 58s

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