refactor!: Stop using implicit cargo metadata

Previously, `Cargo.toml` files were loaded in a way that introduced implicit
metadata, which could cause incorrect behavior in manifests updated by *bomper*.
This commit removes the unnecessary metadata and ensures that *bomper*
will not write excess data when overwriting files.

src/replacers/cargo.rs

@@ -75,8 +75,10 @@ impl Replacer for CargoReplacer {
         // Update each package's Cargo.toml with the new version
         for package in packages {
             let cargo_toml_path = package.manifest_path;
+            let cargo_toml_content = std::fs::read(&cargo_toml_path)?;
 
-            let mut cargo_toml = cargo_toml::Manifest::from_path(&cargo_toml_path)?;
+            let mut cargo_toml = cargo_toml::Manifest::from_slice(&cargo_toml_content)?;
+            // let mut cargo_toml = cargo_toml::Manifest::from_path(&cargo_toml_path)?;
 
             let toml_package = match cargo_toml.package {
                 Some(ref mut package) => package,

src/tests/mod.rs

@@ -165,11 +165,6 @@ name = "package1"
 edition = "2018"
 version = "0.1.0"
 
-[[bin]]
-path = "src/main.rs"
-name = "package1"
-required-features = []
-
 [dependencies]
 package2 = "0.1.0"
 package3 = "0.1.0"
@@ -184,11 +179,6 @@ version = "0.2.0"
 [dependencies]
 package2 = "0.1.0"
 package3 = "0.1.0"
-
-[[bin]]
-path = "src/main.rs"
-name = "package1"
-required-features = []
 "#;
 
         jail.create_file(