build(deps): Bump commons-io:commons-io in /backend (#450)

Bumps commons-io:commons-io from 2.17.0 to 2.18.0.

---
updated-dependencies:
- dependency-name: commons-io:commons-io
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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backend/build.gradle

@@ -76,7 +76,7 @@ dependencies {
 	implementation slf4jDependency
 
 	// https://mvnrepository.com/artifact/commons-io/commons-io
-	implementation group: 'commons-io', name: 'commons-io', version: '2.17.0'
+	implementation group: 'commons-io', name: 'commons-io', version: '2.18.0'
 
 	// https://mvnrepository.com/artifact/com.sparkjava/spark-core
 	implementation group: 'com.sparkjava', name: 'spark-core', version: '2.9.4', {