Bump ehcache from 3.8.1 to 3.9.0 (#20)

Bumps [ehcache](https://github.com/ehcache/ehcache3) from 3.8.1 to 3.9.0.
- [Release notes](https://github.com/ehcache/ehcache3/releases)
- [Commits](https://github.com/ehcache/ehcache3/compare/v3.8.1...v3.9.0)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
diff --git a/parent/pom.xml b/parent/pom.xml
index c3e389e..eb38a50 100644
--- a/parent/pom.xml
+++ b/parent/pom.xml
@@ -35,7 +35,7 @@
         <bcprov.version>1.68</bcprov.version>
         <commons.compress.version>1.20</commons.compress.version>
         <cryptacular.version>1.2.4</cryptacular.version>
-        <ehcache.version>3.8.1</ehcache.version>
+        <ehcache.version>3.9.0</ehcache.version>
         <geronimo.javamail.version>1.8.4</geronimo.javamail.version>
         <hamcrest.version>2.2</hamcrest.version>
         <jasypt.version>1.9.3</jasypt.version>