fix: upgrade com.github.spotbugs:spotbugs-annotations from 4.1.4 to 4.2.0 (#584)

Snyk has created this PR to upgrade com.github.spotbugs:spotbugs-annotations from 4.1.4 to 4.2.0.

See this package in Maven Repository:
https://mvnrepository.com/artifact/com.github.spotbugs/spotbugs-annotations/

See this project in Snyk:
https://app.snyk.io/org/planetlevel/project/f53b118f-f068-49f2-98e2-0b5681787cd7?utm_source=github&utm_medium=upgrade-pr

Author: snyk-bot

pom.xml

@@ -134,7 +134,7 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <version.jmh>1.23</version.jmh>
         <version.powermock>2.0.7</version.powermock>
-        <version.spotbugs>4.1.4</version.spotbugs>
+        <version.spotbugs>4.2.0</version.spotbugs>
 
         <!-- Upgrading to 3.0.0-M3+ causes this test case error:
                 org.owasp.esapi.reference.DefaultValidatorInputStringAPITest.getValidInputNullAllowedPassthrough  Time elapsed: 2.057 s  <<< ERROR!
@@ -529,7 +529,7 @@
                       <goals><goal>enforce</goal></goals>
                       <configuration>
                         <rules>
-                          <dependencyConvergence />
+                          <dependencyConvergence/>
                           <requireJavaVersion>
                             <version>1.7</version>
                             <message>
@@ -540,7 +540,7 @@
                           <enforceBytecodeVersion>
                             <maxJdkVersion>1.7</maxJdkVersion>
                             <ignoreOptionals>true</ignoreOptionals>
-                            <ignoredScopes></ignoredScopes> <!-- 'test' scopes not ignored so we can actually test on Java 7. -->
+                            <ignoredScopes/> <!-- 'test' scopes not ignored so we can actually test on Java 7. -->
                             <message>Dependencies shouldn't require Java 8+</message>
                           </enforceBytecodeVersion>
                         </rules>