Bump maven-core from 3.6.3 to 3.8.1

Bumps [maven-core](https://github.com/apache/maven) from 3.6.3 to 3.8.1.
- [Release notes](https://github.com/apache/maven/releases)
- [Commits](apache/maven@maven-3.6.3...maven-3.8.1)

---
updated-dependencies:
- dependency-name: org.apache.maven:maven-core
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

modules/jooby-bom/pom.xml

@@ -77,7 +77,7 @@
   <maven-assembly-plugin.version>3.3.0</maven-assembly-plugin.version>
   <maven-checkstyle-plugin.version>3.1.2</maven-checkstyle-plugin.version>
   <maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
-  <maven-core.version>3.6.3</maven-core.version>
+  <maven-core.version>3.8.1</maven-core.version>
   <maven-dependency-plugin.version>3.1.2</maven-dependency-plugin.version>
   <maven-deploy-plugin.version>2.8.2</maven-deploy-plugin.version>
   <maven-enforcer-plugin.version>3.0.0-M3</maven-enforcer-plugin.version>

pom.xml

@@ -135,7 +135,7 @@
     <maven-tiles-plugin.version>2.20</maven-tiles-plugin.version>
     <maven-checkstyle-plugin.version>3.1.2</maven-checkstyle-plugin.version>
     <maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
-    <maven-core.version>3.6.3</maven-core.version>
+    <maven-core.version>3.8.1</maven-core.version>
     <maven-deploy-plugin.version>2.8.2</maven-deploy-plugin.version>
     <maven-enforcer-plugin.version>3.0.0-M3</maven-enforcer-plugin.version>
     <maven-gpg-plugin.version>1.6</maven-gpg-plugin.version>