Bump the maven group across 2 directories with 2 updates (#780)

Bumps the maven group with 1 update in the /msal4j-brokers directory: [org.testng:testng](https://github.com/cbeust/testng).
Bumps the maven group with 1 update in the /msal4j-sdk/src/samples/msal-obo-sample directory: [com.google.guava:guava](https://github.com/google/guava).


Updates `org.testng:testng` from 7.1.0 to 7.5.1
- [Release notes](https://github.com/cbeust/testng/releases)
- [Changelog](https://github.com/testng-team/testng/blob/master/CHANGES.txt)
- [Commits](https://github.com/cbeust/testng/commits/7.5.1)

Updates `com.google.guava:guava` from 31.1-jre to 32.0.0-jre
- [Release notes](https://github.com/google/guava/releases)
- [Commits](https://github.com/google/guava/commits)

---
updated-dependencies:
- dependency-name: org.testng:testng
  dependency-type: direct:development
  dependency-group: maven-security-group
- dependency-name: com.google.guava:guava
  dependency-type: direct:production
  dependency-group: maven-security-group
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

msal4j-brokers/pom.xml

@@ -50,7 +50,7 @@
         <dependency>
             <groupId>org.testng</groupId>
             <artifactId>testng</artifactId>
-            <version>7.1.0</version>
+            <version>7.5.1</version>
             <scope>test</scope>
         </dependency>
         <dependency>

msal4j-sdk/src/samples/msal-obo-sample/pom.xml

@@ -75,7 +75,7 @@
         <dependency>
             <groupId>com.google.guava</groupId>
             <artifactId>guava</artifactId>
-            <version>31.1-jre</version>
+            <version>32.0.0-jre</version>
         </dependency>
 
     </dependencies>