Do not include docs in BOM

This was included by mistake and since a docs artifact is not published, it cannot be resolved.

Fixes gh-4585

micrometer-bom/build.gradle

@@ -10,7 +10,8 @@ dependencies {
             !it.name.contains('sample') &&
                     !it.name.contains('benchmark') &&
                     !it.name.contains('micrometer-bom') &&
-                    !it.name.contains('micrometer-osgi-test')
+                    !it.name.contains('micrometer-osgi-test') &&
+                    it.name != 'docs'
         }.each {
             api(group: it.group,
                     name: it.name,