fix(csharpier)!: use csharpier format command

[vincentlabelle]

Since the 1.0.0 release of csharpier, the CLI has changed and the format command is required. Moreover, the --write-stdout option is implicit when the content comes from stdin, and therefore can be removed.

BREAKING-CHANGE: The new arguments for the CLI require csharpier >= 1.0.0.