Bump org.apache.commons:commons-lang3 in /src/userguide

Bumps org.apache.commons:commons-lang3 from 3.1 to 3.18.0.

---
updated-dependencies:
- dependency-name: org.apache.commons:commons-lang3
  dependency-version: 3.18.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

src/userguide/pom.xml

@@ -103,7 +103,7 @@
       <dependency>
           <groupId>org.apache.commons</groupId>
           <artifactId>commons-lang3</artifactId>
-          <version>3.1</version>
+          <version>3.18.0</version>
       </dependency>
       <dependency>
           <groupId>org.apache.commons</groupId>