feat: update cached deposits

[filoozom]

This adds a script to update the cached deposits. It also:

• Adds support for multiple networks
• Implements a retry strategy
• Updates the cached deposits before each deployment

This supersedes #19 and should in general be simpler and more efficient.

Probably requires a few more tweaks down the line (better error handling?), but the project as a whole needs some serious work, so this will come bit by bit.

Closes #19

[4rgon4ut]

Looks good to me, good job! Dropped down one optional comment.