Update Cargo.toml manifest version and docs.rs metadata

- Use precise versions for dependencies. See:
  https://users.rust-lang.org/t/psa-please-specify-precise-dependency-versions-in-cargo-toml/71277
- Use the same style of docs.rs metadata as used in
  artichoke/raw-parts#24.

Cargo.toml

@@ -29,3 +29,10 @@ std = []
 version = "0.9.3"
 default-features = false
 features = ["markdown_deps_updated", "html_root_url_updated"]
+
+[package.metadata.docs.rs]
+# This sets the default target to `x86_64-unknown-linux-gnu` and only builds
+# that target. `focaccie` has the same API and code on all targets.
+default-target = "x86_64-unknown-linux-gnu"
+targets = []
+rustdoc-args = ["--cfg", "docsrs"]