Bump net.logstash.logback:logstash-logback-encoder from 7.3 to 8.1

Bumps [net.logstash.logback:logstash-logback-encoder](https://github.com/logfellow/logstash-logback-encoder) from 7.3 to 8.1.
- [Release notes](https://github.com/logfellow/logstash-logback-encoder/releases)
- [Commits](logfellow/logstash-logback-encoder@logstash-logback-encoder-7.3...logstash-logback-encoder-8.1)

---
updated-dependencies:
- dependency-name: net.logstash.logback:logstash-logback-encoder
  dependency-version: '8.1'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

spring-boot-2-demo-app/build.gradle.kts

@@ -42,7 +42,7 @@ dependencies {
     implementation("ch.qos.logback:logback-classic:1.2.13") {
         because("The version is higher than in BOM")
     }
-    implementation("net.logstash.logback:logstash-logback-encoder:7.3") {
+    implementation("net.logstash.logback:logstash-logback-encoder:8.1") {
         because("Versions that are higher require slf4j 2")
     }
 

spring-boot-3-demo-app/build.gradle.kts

@@ -31,7 +31,7 @@ dependencies {
     implementation("org.liquibase:liquibase-core")
     implementation("com.github.blagerweij:liquibase-sessionlock")
     implementation("net.ttddyy.observation:datasource-micrometer-spring-boot:1.1.0")
-    implementation("net.logstash.logback:logstash-logback-encoder:8.0")
+    implementation("net.logstash.logback:logstash-logback-encoder:8.1")
 
     testImplementation("org.springframework.boot:spring-boot-starter-test")
     testImplementation("org.springframework.boot:spring-boot-starter-webflux")