build: Centralize rust-vmm crates to workspace

Modify `Cargo.toml` in each member crate to follow the dependencies
specified in root `Cargo.toml` file.

Signed-off-by: Ruoqing He <heruoqing@iscas.ac.cn>

vm-migration/Cargo.toml

@@ -9,7 +9,4 @@ anyhow = "1.0.87"
 serde = { version = "1.0.208", features = ["derive", "rc"] }
 serde_json = "1.0.120"
 thiserror = "1.0.62"
-vm-memory = { version = "0.15.0", features = [
-  "backend-atomic",
-  "backend-mmap",
-] }
+vm-memory = { workspace = true, features = ["backend-atomic", "backend-mmap"] }