Bump testng from 7.5 to 7.6.0

Bumps [testng](https://github.com/cbeust/testng) from 7.5 to 7.6.0.
- [Release notes](https://github.com/cbeust/testng/releases)
- [Changelog](https://github.com/cbeust/testng/blob/master/CHANGES.txt)
- [Commits](testng-team/testng@7.5...7.6.0)

---
updated-dependencies:
- dependency-name: org.testng:testng
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

hmac-auth-common/build.gradle

@@ -10,7 +10,7 @@ dependencies {
 
     compile 'org.slf4j:slf4j-api:1.7.36'
 
-    testCompile 'org.testng:testng:7.5'
+    testCompile 'org.testng:testng:7.6.0'
     testCompile 'org.hamcrest:hamcrest-core:2.2'
     testCompile 'org.hamcrest:hamcrest-library:2.2'
     testCompile 'org.mockito:mockito-core:4.5.1'

hmac-auth-jersey-client/build.gradle

@@ -16,7 +16,7 @@ dependencies {
 
     compile project(path: ":hmac-auth-common")
 
-    testCompile 'org.testng:testng:7.5'
+    testCompile 'org.testng:testng:7.6.0'
     testCompile 'org.hamcrest:hamcrest-core:2.2'
     testCompile 'org.hamcrest:hamcrest-library:2.2'
     testCompile 'org.mockito:mockito-core:4.5.1'

hmac-auth-proxy/build.gradle

@@ -19,7 +19,7 @@ dependencies {
 
     runtime 'org.slf4j:slf4j-log4j12:1.7.36'
 
-    testCompile 'org.testng:testng:7.5'
+    testCompile 'org.testng:testng:7.6.0'
     testCompile 'org.hamcrest:hamcrest-library:2.2'
     testCompile 'org.mockito:mockito-core:4.5.1'
 }

hmac-auth-server/build.gradle

@@ -7,7 +7,7 @@ dependencies {
 
     compile project(path: ":hmac-auth-common")
 
-    testCompile 'org.testng:testng:7.5'
+    testCompile 'org.testng:testng:7.6.0'
     testCompile 'org.hamcrest:hamcrest-core:2.2'
     testCompile 'org.hamcrest:hamcrest-library:2.2'
     testCompile 'org.mockito:mockito-core:4.5.1'