fix(deps): bump com.google.guava:guava in /mylyn.docs

Bumps [com.google.guava:guava](https://github.com/google/guava) from 33.4.7-jre to 33.4.8-jre.
- [Release notes](https://github.com/google/guava/releases)
- [Commits](https://github.com/google/guava/commits)

---
updated-dependencies:
- dependency-name: com.google.guava:guava
  dependency-version: 33.4.8-jre
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

mylyn.docs/wikitext/core/pom.xml

@@ -30,7 +30,7 @@
 	<properties>
 		<guava.osgi>33.0</guava.osgi>
 		<guava.osgi.upper>34.0</guava.osgi.upper>
-		<guava.version>33.4.7-jre</guava.version>
+		<guava.version>33.4.8-jre</guava.version>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<maven.javadoc.skip>true</maven.javadoc.skip>
 	</properties>

mylyn.docs/wikitext/ui/org.eclipse.mylyn.wikitext.help.ui/pom.xml

@@ -117,7 +117,7 @@
 					<dependency>
 						<groupId>com.google.guava</groupId>
 						<artifactId>guava</artifactId>
-						<version>33.4.7-jre</version>
+						<version>33.4.8-jre</version>
 					</dependency>
 					<dependency>
 					    <groupId>org.apache.commons</groupId>