fix(rust): track the 03 patch symlink

recipes/.gitignore ignores *.patch, so the symlink created alongside
patch 03 was left untracked while 01 and 02 are tracked (force-added
past the same rule). A clean checkout would fetch rust, find
patches = [... "03-generate-copyright-path-deps.patch"] in recipe.toml,
and fail to resolve it.

Force-added to match 01/02.

recipes/dev/rust/03-generate-copyright-path-deps.patch

@@ -0,0 +1 @@
+../../../local/patches/rust/03-generate-copyright-path-deps.patch