Update office hour examples to Gradle 7.0.2

OfficeHours-CompileSimpleJava/build.gradle

...eHours-CompileSimpleJava/config/checkstyle/checkstyle.xml

...Hours-CompileSimpleJava/gradle/wrapper/gradle-wrapper.jar

...ompileSimpleJava/gradle/wrapper/gradle-wrapper.properties

OfficeHours-CompileSimpleJava/gradlew

OfficeHours-CompileSimpleJava/gradlew.bat

OfficeHours-Gradle-File-Task/build.gradle

...eHours-Gradle-File-Task/gradle/wrapper/gradle-wrapper.jar

...Gradle-File-Task/gradle/wrapper/gradle-wrapper.properties

OfficeHours-Gradle-File-Task/gradlew

OfficeHours-Gradle-File-Task/gradlew.bat

OfficeHours-IniExample/build.gradle

OfficeHours-IniExample/config/checkstyle/checkstyle.xml

OfficeHours-IniExample/gradle/wrapper/gradle-wrapper.jar

...Hours-IniExample/gradle/wrapper/gradle-wrapper.properties

OfficeHours-IniExample/gradlew

OfficeHours-IniExample/gradlew.bat

OfficeHours-JSON-IO/build.gradle

OfficeHours-JSON-IO/gradle/wrapper/gradle-wrapper.jar

OfficeHours-JSON-IO/gradle/wrapper/gradle-wrapper.properties