Bump up several libraries (#2202)

* Removed the following unused libraries:
- org.ehcache:ehcache 3.8.1
- javax.cache:cache-api 1.0.0
- commons-httpclient:commons-httpclient 3.1

Upgraded the following to versions provided by SPring Boot 2.7
-- org.apache.commons:commons-lang3 3.9 -> 3.12.0
-- com.google.code.gson:gson 2.8.9 -> 2.9.0
-- com.zaxxer:HikariCP 3.3.1 -> 4.0.3
-- com.microsoft.sqlserver:mssql-jdbc 9.2.1.jre8 -> 10.2.1.jre8

* Removing unnecessary comments.

pom.xml

@@ -706,15 +706,6 @@
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-cache</artifactId>
     </dependency>
-    <dependency>
-      <groupId>javax.cache</groupId>
-      <artifactId>cache-api</artifactId>
-    </dependency>
-    <dependency>
-      <groupId>org.ehcache</groupId>
-      <artifactId>ehcache</artifactId>
-      <version>3.8.1</version>
-    </dependency>
     <dependency>
       <groupId>org.hibernate</groupId>
       <artifactId>hibernate-core</artifactId>
@@ -791,7 +782,7 @@
     <dependency>
       <groupId>org.apache.commons</groupId>
       <artifactId>commons-lang3</artifactId>
-      <version>3.9</version>
+      <version>3.12.0</version>
     </dependency>
     <dependency>
       <groupId>org.flywaydb</groupId>
@@ -803,11 +794,6 @@
       <artifactId>httpclient</artifactId>
       <version>4.5.13</version>
     </dependency>
-    <dependency>
-      <groupId>commons-httpclient</groupId>
-      <artifactId>commons-httpclient</artifactId>
-      <version>3.1</version>
-    </dependency>
     <dependency>
       <groupId>org.springframework.batch</groupId>
       <artifactId>spring-batch-admin-manager</artifactId>
@@ -852,7 +838,7 @@
     <dependency>
       <groupId>com.microsoft.sqlserver</groupId>
       <artifactId>mssql-jdbc</artifactId>
-      <version>9.2.1.jre8</version>
+      <version>10.2.1.jre8</version>
     </dependency>
     <dependency>
       <groupId>com.microsoft.azure</groupId>
@@ -1023,12 +1009,12 @@
     <dependency>
       <groupId>com.zaxxer</groupId>
       <artifactId>HikariCP</artifactId>
-      <version>3.3.1</version>
+      <version>4.0.3</version>
     </dependency>
     <dependency>
       <groupId>com.google.code.gson</groupId>
       <artifactId>gson</artifactId>
-      <version>2.8.9</version>
+      <version>2.9.0</version>
     </dependency>
     <dependency>
       <groupId>org.jasypt</groupId>