Upgrade slf4j, guava, and junit

Author: Gary Keim

pom.xml

@@ -20,14 +20,14 @@
         <jackson.version>2.13.2</jackson.version>
         <jersey.version>2.35</jersey.version>
 
-        <guava.version>30.1.1-jre</guava.version>
+        <guava.version>31.1-jre</guava.version>
         <groovy.version>3.0.10</groovy.version>
         <shiro.version>1.8.0</shiro.version>
         <csrfguard.version>4.1.3</csrfguard.version>
 
-        <slf4j.version>1.7.35</slf4j.version>
+        <slf4j.version>1.7.36</slf4j.version>
         <logback.version>1.2.11</logback.version>
-        <junit.version>4.13.1</junit.version>
+        <junit.version>4.13.2</junit.version>
         <commons-beanutils.version>1.9.4</commons-beanutils.version>
         <hamcrest.version>2.1</hamcrest.version>
         <mockito-core.version>3.0.0</mockito-core.version>