Upgrade Micrometer 1.13.6 -> 1.14.0 (#1415)

While there, use the provided BOM.

See:
- https://github.com/micrometer-metrics/micrometer/releases/tag/v1.14.0
- https://github.com/micrometer-metrics/micrometer/releases/tag/v1.13.7
- micrometer-metrics/micrometer@v1.13.6...v1.14.0

pom.xml

@@ -367,8 +367,10 @@
             </dependency>
             <dependency>
                 <groupId>io.micrometer</groupId>
-                <artifactId>micrometer-core</artifactId>
-                <version>1.13.6</version>
+                <artifactId>micrometer-bom</artifactId>
+                <version>1.14.0</version>
+                <type>pom</type>
+                <scope>import</scope>
             </dependency>
             <dependency>
                 <groupId>io.projectreactor</groupId>