Bump io.lettuce:lettuce-core in /smoke-test

Bumps [io.lettuce:lettuce-core](https://github.com/redis/lettuce) from 6.8.0.RELEASE to 6.8.1.RELEASE.
- [Release notes](https://github.com/redis/lettuce/releases)
- [Changelog](https://github.com/redis/lettuce/blob/6.8.1.RELEASE/RELEASE-NOTES.md)
- [Commits](redis/lettuce@6.8.0.RELEASE...6.8.1.RELEASE)

---
updated-dependencies:
- dependency-name: io.lettuce:lettuce-core
  dependency-version: 6.8.1.RELEASE
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

docs/examples/junit5/redis/build.gradle

@@ -1,7 +1,7 @@
 description = "Examples for docs"
 
 dependencies {
-    api "io.lettuce:lettuce-core:6.8.0.RELEASE"
+    api "io.lettuce:lettuce-core:6.8.1.RELEASE"
 
     testImplementation 'org.junit.jupiter:junit-jupiter-api:5.13.4'
     testImplementation 'org.junit.jupiter:junit-jupiter-params:5.13.4'

docs/examples/spock/redis/build.gradle

@@ -4,7 +4,7 @@ plugins {
 }
 
 dependencies {
-    api "io.lettuce:lettuce-core:6.8.0.RELEASE"
+    api "io.lettuce:lettuce-core:6.8.1.RELEASE"
     testImplementation 'org.spockframework:spock-core:2.3-groovy-4.0'
     testImplementation project(":testcontainers-spock")
     testImplementation 'ch.qos.logback:logback-classic:1.3.15'