Update PROW CI developer documentation

[mateusoliveira43]

Update

oadp-operator/docs/developer/PROW_CI.md

Lines 73 to 81 in ea7ccc4

	### Update Go version
	To update the Go version used in CI jobs of a branch:
	- Update the image used in `build_root` instruction of ALL jobs of that branch.
	> **Note:** images referenced in `build_root` instruction ([which creates `root` image, that is tagged into `src`](https://docs.ci.openshift.org/docs/internals/)) of the config files, are defined in [here](https://github.com/openshift-eng/ocp-build-data/tree/main), under the specific branch. For example, `openshift-4.14` images are defined [here](https://github.com/openshift-eng/ocp-build-data/blob/openshift-4.14/streams.yml). The OCP version of this images do NOT have to be the same as the OCP version that the job is being tested against. We only care about the `Go` version in these images. But we DO have to use the same image between the jobs of the same branch, for consistency.
	**TODO automate this process**

As it is not valid anymore after openshift/release#52892 (comment)

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