BOM contains a non-resolvable dependency: io.micrometer:concurrency-tests

Looks like a new docs module was added.

This isn't published to maven (correctly), but it appears in the BOM as a dependency (incorrectly)

https://central.sonatype.com/artifact/io.micrometer/micrometer-bom/1.13.3

```xml
  <dependency>
        <groupId>io.micrometer</groupId>
        <artifactId>concurrency-tests</artifactId>
        <version>1.13.3</version>
      </dependency>
```