Bump org.apache.sling.servlets.post from 2.3.0 to 2.3.8

Bumps org.apache.sling.servlets.post from 2.3.0 to 2.3.8.

---
updated-dependencies:
- dependency-name: org.apache.sling:org.apache.sling.servlets.post
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/pom.xml b/pom.xml
index d9da5b7..5e9929d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -273,7 +273,7 @@
     <dependency>
       <groupId>org.apache.sling</groupId>
       <artifactId>org.apache.sling.servlets.post</artifactId>
-      <version>2.3.0</version>
+      <version>2.3.8</version>
     </dependency>
     <dependency>
       <groupId>org.apache.sling</groupId>