CONTRIBUTING.md: Update policy repo to fallback to OSTC

booting.op.o will shutdown soon, fallbacking to ostc as it's not yet ready at eclipse.

Relate-to: #787 (closed) Relate-to: https://git.ostc-eu.org/oss-compliance/ip-policy/-/issues/18 Forwarded: https://gitlab.eclipse.org/eclipse/oniro-core/oniro/-/merge_requests?author_username=pcoval&scope=all&state=all Signed-off-by: Philippe Coval philippe.coval.ext@huawei.com

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• 6a12cece - CONTRIBUTING.md: Update policy repo to fallback to OSTC

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