Update dependency net.logstash.logback:logstash-logback-encoder to v9

Author: renovate[bot]

logstash-logging-spring-boot-starter/pom.xml

@@ -31,7 +31,7 @@
         <java.version>17</java.version>
         <commons-io.version>2.21.0</commons-io.version>
         <javax-servlet.version>6.1.0</javax-servlet.version>
-        <logstash-logback.version>8.1</logstash-logback.version>
+        <logstash-logback.version>9.0</logstash-logback.version>
         <spring.version>6.2.12</spring.version>
         <spring.boot.version>3.5.7</spring.boot.version>
         <slf4j.version>2.0.17</slf4j.version>

reactive-logstash-logging-spring-boot-starter/pom.xml

@@ -30,7 +30,7 @@
     <properties>
         <java.version>17</java.version>
         <commons-io.version>2.21.0</commons-io.version>
-        <logstash-logback.version>8.1</logstash-logback.version>
+        <logstash-logback.version>9.0</logstash-logback.version>
         <spring.version>6.2.12</spring.version>
         <spring.boot.version>3.5.7</spring.boot.version>
         <slf4j.version>2.0.17</slf4j.version>