bump: update lsp-server requirement from 0.6.0 to 0.7.0 (#511)

Updates the requirements on [lsp-server](https://github.com/rust-lang/rust-analyzer) to permit the latest version.
- [Release notes](https://github.com/rust-lang/rust-analyzer/releases)
- [Commits](https://github.com/rust-lang/rust-analyzer/commits)

---
updated-dependencies:
- dependency-name: lsp-server
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

crates/mun_language_server/Cargo.toml

@@ -24,7 +24,7 @@ anyhow = { version = "1.0", default-features = false, features=["std"] }
 crossbeam-channel = { version = "0.5.0", default-features = false }
 log = { version = "0.4", default-features = false }
 lsp-types = { version = "0.93.0", default-features = false }
-lsp-server = { version = "0.6.0", default-features = false }
+lsp-server = { version = "0.7.0", default-features = false }
 parking_lot = { version = "0.12.0", default-features = false }
 ra_ap_text_edit = { version = "0.0.149", default-features = false }
 rustc-hash = { version = "1.1.0", default-features = false }