Replace dependency on dirs with home (#1490)

The `dirs` crate recently started depending on the `options-ext` crate
which uses copyleft license (MPL). This unnecessary dependency causes
minor inconveniences by e.g. requiring users to ship a download link
to the crate's source code (already published on crates.io). More
importantly, we would like to not have more random questions about
licensing updates that seem like they are poorly motivated.

This change replaces the `dirs` crate with `home`. The `home` crate is
maintained by the cargo team and offers the same functionality.

pgrx-pg-config/Cargo.toml

@@ -28,7 +28,7 @@ eyre.workspace = true
 owo-colors.workspace = true
 url.workspace = true
 
-dirs = "5.0.1"
+home = "0.5.9"
 pathsearch = "0.2.0"
 serde = { version = "1.0", features = [ "derive" ] }
 serde_derive = "1.0"

pgrx-pg-config/src/lib.rs

@@ -633,7 +633,7 @@ impl Pgrx {
     pub fn home() -> Result<PathBuf, PgrxHomeError> {
         let pgrx_home = std::env::var("PGRX_HOME").map_or_else(
             |_| {
-                let mut pgrx_home = match dirs::home_dir() {
+                let mut pgrx_home = match home::home_dir() {
                     Some(home) => home,
                     None => return Err(PgrxHomeError::NoHomeDirectory),
                 };