Update GitHub actions & enable Dependabot for them #822
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Purpose
Updates GitHub actions used by the workflows, and configures Dependabot to also update GitHub actions.
The previous workflow executions were already causing warnings due to Node.js 16 actions being deprecated.
Approach
For the Gradle actions I changed the repository because https://github.com/gradle/actions is now the main repository for all Gradle-related actions. See also the README of https://github.com/gradle/wrapper-validation-action and https://github.com/gradle/gradle-build-action.
Note that I did not (and cannot) test the changes in
push-build-deploy.yml
, but I think they should be equivalent to the previous setup.