[CI skip] Update dependency me.clip:placeholderapi to v2.11.6

Author: renovate[bot]

pom.xml

@@ -455,7 +455,7 @@
         <dependency>
             <groupId>me.clip</groupId>
             <artifactId>placeholderapi</artifactId>
-            <version>2.11.5</version>
+            <version>2.11.6</version>
             <scope>provided</scope>
 
             <exclusions>