build(cargo): Update vergen to v8 (#8325)

**Description:**

Updates `vergen` build dependency in `swc_core` to v8. This reduces the amount of dependency duplication. In my case in particular, it allows me to remove `syn` v1 from my [repository](https://github.com/redfire75369/spiderfire).

Author: Redfire75369

Cargo.lock

@@ -369,7 +369,7 @@ testing                          = { optional = true, version = "0.35.11", path
 swc_plugin_runner = { optional = true, version = "0.104.29", path = "../swc_plugin_runner", default-features = false }
 
 [build-dependencies]
-vergen = { version = "7.3.2", default-features = false, features = ["cargo"] }
+vergen = { version = "8.0.0", default-features = false, features = ["cargo"] }
 
 [dev-dependencies]
 anyhow = "1.0.71"

crates/swc_core/Cargo.toml

@@ -5,7 +5,7 @@ use std::{
     path::Path,
 };
 
-use vergen::{vergen, Config};
+use vergen::EmitBuilder;
 
 // Validate conflict between host / plugin features
 #[cfg(all(
@@ -42,5 +42,5 @@ fn main() {
 
     // Attempt to collect some build time env values but will skip if there are any
     // errors.
-    let _ = vergen(Config::default());
+    let _ = EmitBuilder::builder().all_cargo().emit();
 }