Broken badge version number in README.md

[CarrotManMatt]

As outlined in badges/shields#10594, using query expressions to find the value of an item within a toml file is no longer supported due to a security vulnerability. We used this to search through the array of packages within poetry.lock and find the current locked version of Py-Cord that is in use.

The change to the shield badges project means this search is no longer available and an alternative solution must be found. Perhaps the change to use a uv.lock format, once #329 is implemented, could help? More investigation on the uv.lock format is required.