Update immediate and transitive dependencies

I don't think this has happened in awhile but I've run a `cargo update`
as well as trimming some of the duplicate/older dependencies in
`Cargo.lock` by updating some of our immediate dependencies as well.

crates/c-api/Cargo.toml

@@ -17,7 +17,7 @@ test = false
 doctest = false
 
 [dependencies]
-env_logger = "0.7"
+env_logger = "0.8"
 anyhow = "1.0"
 once_cell = "1.3"
 wasmtime = { path = "../wasmtime", default-features = false }