[build] Fix debian mirror snapshot timestamp not work issue. (#21758) #21767
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Why I did it
PR21366 wants to use debian snapshot instead of version pinning to improve image quality. But it missed this change. Build is using latest debian snapshot instead of validated snapshot.
Now validated snapshot is '20250130'. details in this link. But we can find build is using '20250216', which is a bad snapshot. It breaks SONiC build since Feb 16.
Work item tracking
How I did it
Fix debian mirror snapshot timestamp generate script.
How to verify it
Which release branch to backport (provide reason below if selected)
Tested branch (Please provide the tested image version)
Description for the changelog
Link to config_db schema for YANG module changes
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