Remove 'load-dynamic' feature of 'ort' dependency

It's unclear why we'd want this feature. It seems to make things even
less isolated and self-contained than it already is, which certainly
isn't a boon for an example.

examples/rust-example/Cargo.lock

@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "adler"
@@ -206,16 +206,6 @@ version = "0.2.155"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "97b3888a4aecf77e811145cadf6eef5901f4782c53886191b2f693f24761847c"
 
-[[package]]
-name = "libloading"
-version = "0.8.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0c2a198fb6b0eada2a8df47933734e6d35d350665a33a3593d7164fa52c75c19"
-dependencies = [
- "cfg-if",
- "windows-targets",
-]
-
 [[package]]
 name = "linux-raw-sys"
 version = "0.4.14"
@@ -301,7 +291,6 @@ checksum = "0bc80894094c6a875bfac64415ed456fa661081a278a035e22be661305c87e14"
 dependencies = [
  "half",
  "js-sys",
- "libloading",
  "ndarray",
  "ort-sys",
  "thiserror",