update workflow to support basedmypy

[KotlinIsland]

Description

update shell scripts to support inputs like basedmypy-2.8.0

Expected Behavior

shell scripts can now generate configurations for basedmypy

[ymyzk]

I see the following error when running the updated script. There might be a syntax error?

./sandbox/add_version.sh: line 32: syntax error near unexpected token `)'

Here's the shellcheck result for reference:

[Line 29:](javascript:setPosition(29, 1))
case $version in
^-- [SC1009](https://www.shellcheck.net/wiki/SC1009) (info): The mentioned syntax error was in this case expression.
 
[Line 30:](javascript:setPosition(30, 3))
  "basedmypy-"*)
  ^-- [SC1073](https://www.shellcheck.net/wiki/SC1073) (error): Couldn't parse this case item. Fix to allow more checks.
 
[Line 32:](javascript:setPosition(32, 4))
  *)
   ^-- [SC1072](https://www.shellcheck.net/wiki/SC1072) (error): Fix any mentioned problems and try again.
   ^-- [SC1074](https://www.shellcheck.net/wiki/SC1074) (error): Did you forget the ;; after the previous case item?