Update to current Roc syntax

roc-pg has been migrated to work with the newest version of the compiler and platforms.

Thanks to @niclas-ahden for the massive effort!

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Add this version of roc-pg to your app dependencies, like this:

app [main!] {
    # ...,
    pg: "https://github.com/agu-z/roc-pg/releases/download/0.1.1/PjwASOJalDKErbHkj3bXskhGbgqGzVSbki4Nv7xOEe0.tar.br",
}