chore: pin the plugin template to the host's codec 85bb5a2

codec 85bb5a2 fixes the BLOCKVISIBILITYPARAMETER DXF defect: AcDbEvalExpr
ends after 90/98/99 when the eval has no value instead of emitting a stray
70 -9999. Readers rejected that group 70 ('Unexpected DXF group code: 70')
and discarded every visibility-bearing drawing on open.

docs/plugin-template-v2/Cargo.toml

@@ -16,4 +16,4 @@ ocs_plugin_api = { path = "../../crates/ocs_plugin_api", features = ["host"] }
 # entry): the plugin's entities and the host's re-exports are the same types
 # only when both resolve the same revision. The registration `rustc` /
 # `acadrust_source` gates enforce this at load time too.
-acadrust = { package = "opencadcodec", git = "https://github.com/HakanSeven12/opencadcodec.git", rev = "357cfed" }
+acadrust = { package = "opencadcodec", git = "https://github.com/HakanSeven12/opencadcodec.git", rev = "85bb5a2" }