chore: replace ius-release package in Dockerfile.tools

[xcoulon]

Replace CentOS ius-release package. See iusrepo/announce#18

Signed-off-by: Xavier Coulon xcoulon@redhat.com

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@xcoulon: The following tests failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
ci/prow/lint	c3ed54d	link	/test lint
ci/prow/build	c3ed54d	link	/test build
ci/prow/test	c3ed54d	link	/test test
ci/prow/images	c3ed54d	link	/test images
ci/prow/e2e	c3ed54d	link	/test e2e

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