Update Rust crate redb to 1.4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
redb (source)	dependencies	minor	1.3 -> 1.4

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Release Notes

cberner/redb (redb)

v1.4.0

Compare Source

• Add Builder::set_repair_callback() which can be used to set a callback function that will be invoked if the database needs repair while opening it.
• Add support for custom storage backends. This is done by implementing the StorageBackend trait and
  using the Builder::create_with_backend function. This allows the database to be stored in a location other
  than the filesystem
• Implement RedbKey and RedbValue for char
• Implement RedbKey and RedbValue for bool
• Implement TableHandle for Table
• Implement MultimapTableHandle for MultimapTable
• Fix panic that could occur when inserting a large number of fixed width values into a table within a single transaction
• Fix panic when calling delete_table() on a table that is already open
• Improve performance for fixed width types
• Support additional platforms

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