bugfix: lsp-rust-analyzer-cargo-cfgs default value (#4920)

* bugfix: lsp-rust-analyzer-cargo-cfgs default value

Resolves this error with rust LSP:

```
LSP :: invalid config value:
/cargo/cfgs: invalid type: map, expected a string;
```

* update CHANGELOG

Author: Cbeck527

CHANGELOG.org

@@ -51,6 +51,7 @@
   * Debugging tests in Rust no longer runs all the tests prior to launching debug session.
   * Add [[https://devenv.sh/][devenv]] and [[https://jj-vcs.github.io/jj/latest/][jj]] directories to the list of ignored directories (~lsp-file-watch-ignored-directories~)
   * Fix bug where qmlls failed to load due to qml not being in ~lsp-language-id-configuration~
+  * Fix default value for ~lsp-rust-analyzer-cargo-cfgs~
 
 ** 9.0.0
   * Add language server config for QML (Qt Modeling Language) using qmlls.

clients/lsp-rust.el

@@ -860,7 +860,7 @@ or JSON objects in `rust-project.json` format."
   :package-version '(lsp-mode . "8.0.0"))
 
 ;; https://rust-analyzer.github.io/book/configuration#cargo.cfgs
-(defcustom lsp-rust-analyzer-cargo-cfgs ["debug_assertions", "miri"]
+(defcustom lsp-rust-analyzer-cargo-cfgs ["debug_assertions" "miri"]
   "Extra configurations that are passed to every cargo invocation."
   :type 'lsp-string-vector
   :group 'lsp-rust-analyzer