fix(deps): Downgrade minisign to 0.7.3 again

[FabianLars]

rust-minisign was upgraded to 0.7.5 in the last patch release via #7641 even though it was pinned. It was downgraded because 0.7.5 breaks the update bundle signer if an empty password is provided, see FabianLars/mw-toolbox#550 (pr that made me notice the change) and jedisct1/rust-minisign#26 (upstream issue i opened) and #7197 (the last time i downgraded it)

What kind of change does this PR introduce?

• Bugfix
• Feature
• Docs
• New Binding issue #___
• Code style update
• Refactor
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change?

• Yes, and the changes were approved in issue #___
• No

Checklist

• When resolving issues, they are referenced in the PR's title (e.g fix: remove a typo, closes #___, #___)
• A change file is added if any packages will require a version bump due to this PR per the instructions in the readme.
• I have added a convincing reason for adding this feature, if necessary

Other information

[antkit]

Waiting for merging, as i upgrade tauri from 1.4 to 1.5 yesterday and now i can't build my project with empty password...