The cargo team still hasn't published version 0.72.1 to crates.io since pulling 0.72, so it's currently impossible to install cargo-espflash.
However, in the meantime, they appear to have fixed installing cargo-espflash with 0.71. So perhaps it's worth reverting the dependency to that version.
This reverts commit 7ce1ca203b54021fe681d08944b0c83c8d4ab57c.
The cargo team still hasn't published version 0.72.1 to crates.io since pulling 0.72, so it's currently impossible to install cargo-espflash.
However, in the meantime, they appear to have fixed installing cargo-espflash with 0.71. So perhaps it's worth reverting the dependency to that version.
This reverts commit 7ce1ca203b54021fe681d08944b0c83c8d4ab57c.