fix: pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-COMFASTERXMLJACKSONCORE-7569538
- https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARS-7444596
- https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARS-7444620

pom.xml

@@ -120,15 +120,15 @@
 
         <!-- Shared properties with plugins and version numbers across submodules-->
         <asciidoctorj.version>2.5.3</asciidoctorj.version>
-        <bootstrap.version>3.3.7</bootstrap.version>
+        <bootstrap.version>4.0.0</bootstrap.version>
         <cglib.version>2.2</cglib.version> <!-- do not update necessary for lesson -->
         <checkstyle.version>3.1.2</checkstyle.version>
         <commons-collections.version>3.2.1</commons-collections.version>
         <commons-lang3.version>3.12.0</commons-lang3.version>
         <commons-io.version>2.6</commons-io.version>
         <commons-text.version>1.9</commons-text.version>
         <guava.version>30.1-jre</guava.version>
-        <jjwt.version>0.9.1</jjwt.version>
+        <jjwt.version>0.12.0</jjwt.version>
         <jose4j.version>0.7.6</jose4j.version>
         <jsoup.version>1.14.3</jsoup.version>
         <jquery.version>3.5.1</jquery.version>