ci: upgrade gradle image from 6.5 to 7.5.1

[cjoyv]

Signed-off-by: cjoyv chinu.joy@intel.com

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Please check if your PR fulfills the following requirements:

• [x] The commit message follows our guidelines: https://github.com/edgexfoundry/ci-management/blob/master/.github/CONTRIBUTING.md

• [ ] Tests for the changes have been added (for bug fixes / features)

• [x] Added labels

  PR Type

  What kind of change does this PR introduce?

• [ ] Bugfix

• [ ] Feature

• [ ] Code style update (formatting, local variables)

• [x] Refactoring (no functional changes, no api changes)

• [ ] Documentation content changes

• [ ] Other... Please describe:

Issue Number:

https://github.com/edgexfoundry/ci-build-images/issues/199

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