Fix rotate_db_snapshot ARN template

[sarayourfriend]

Description

I incorrectly applied the code from Madison's suggestion and it is causing a JSON parse error (because the ARN shouldn't be parsed as JSON at all 😅)

#904 (comment)

Testing Instructions

Not sure? Can a unit test be written for this kind of thing?

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[AetherUnbound]

Looks good!

[zackkrida]

LGTM.