Polish "Start building against Micrometer 1.10.0 snapshots"

See gh-30693

Author: snicoll

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/observation/ObservationAutoConfigurationTests.java

@@ -22,7 +22,6 @@
 import io.micrometer.common.KeyValue;
 import io.micrometer.common.KeyValues;
 import io.micrometer.core.instrument.MeterRegistry;
-import io.micrometer.core.instrument.Tags;
 import io.micrometer.core.instrument.observation.MeterObservationHandler;
 import io.micrometer.core.instrument.search.MeterNotFoundException;
 import io.micrometer.observation.Observation;