Bump slf4j-api from 1.7.29 to 1.7.30 in /examples (#2190)

Bumps [slf4j-api](https://github.com/qos-ch/slf4j) from 1.7.29 to 1.7.30.
- [Release notes](https://github.com/qos-ch/slf4j/releases)
- [Commits](qos-ch/slf4j@v_1.7.29...v_1.7.30)

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

Co-authored-by: null <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

examples/linked-container/build.gradle

@@ -6,7 +6,7 @@ repositories {
     jcenter()
 }
 dependencies {
-    compileOnly 'org.slf4j:slf4j-api:1.7.29'
+    compileOnly 'org.slf4j:slf4j-api:1.7.30'
     implementation 'com.squareup.okhttp3:okhttp:3.14.4'
     implementation 'org.json:json:20180813'
     testImplementation 'org.postgresql:postgresql:42.2.9'

examples/redis-backed-cache-testng/build.gradle

@@ -7,7 +7,7 @@ repositories {
 }
 
 dependencies {
-    compileOnly 'org.slf4j:slf4j-api:1.7.29'
+    compileOnly 'org.slf4j:slf4j-api:1.7.30'
     implementation 'redis.clients:jedis:3.2.0'
     implementation 'com.google.code.gson:gson:2.8.6'
     implementation 'com.google.guava:guava:23.0'

examples/redis-backed-cache/build.gradle

@@ -7,7 +7,7 @@ repositories {
 }
 
 dependencies {
-    compileOnly 'org.slf4j:slf4j-api:1.7.29'
+    compileOnly 'org.slf4j:slf4j-api:1.7.30'
     implementation 'redis.clients:jedis:3.2.0'
     implementation 'com.google.code.gson:gson:2.8.6'
     implementation 'com.google.guava:guava:23.0'

examples/singleton-container/build.gradle

@@ -11,7 +11,7 @@ dependencies {
     implementation 'redis.clients:jedis:3.2.0'
     implementation 'com.google.code.gson:gson:2.8.6'
     implementation 'com.google.guava:guava:23.0'
-    compileOnly 'org.slf4j:slf4j-api:1.7.29'
+    compileOnly 'org.slf4j:slf4j-api:1.7.30'
 
     testImplementation 'ch.qos.logback:logback-classic:1.2.3'
     testImplementation 'org.testcontainers:testcontainers'