Upgrade to wavefront-sdk-java 2.6.6

fixes gh-2860

Author: jonatan-ivanov

implementations/micrometer-registry-wavefront/gradle.lockfile

@@ -172,8 +172,8 @@ public Duration step() {
         WavefrontClient sender = builder.build();
         assertThat(builder).hasFieldOrPropertyWithValue("flushInterval", 15_000L);
         assertThat(builder).hasFieldOrPropertyWithValue("flushIntervalTimeUnit", TimeUnit.MILLISECONDS);
-        assertThat(sender).extracting("reportingService").hasFieldOrPropertyWithValue("uri", URI.create("https://example.com"));
-        assertThat(sender).extracting("reportingService").hasFieldOrPropertyWithValue("token", "apiToken");
+        assertThat(sender).extracting("metricsReportingService").hasFieldOrPropertyWithValue("uri", URI.create("https://example.com"));
+        assertThat(sender).extracting("metricsReportingService").hasFieldOrPropertyWithValue("token", "apiToken");
         assertThat(sender).hasFieldOrPropertyWithValue("batchSize", 20);
     }