chore(deps): update bitnami/oras docker tag to v1.2.0-debian-12-r8

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
bitnami/oras	final	patch	1.2.0-debian-12-r7 -> 1.2.0-debian-12-r8

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[ti-chi-bot]

Hi @renovate[bot]. Thanks for your PR.

I'm waiting for a PingCAP-QE member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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