chore: pin chain-module-sdk v0.3.0 and switch to #[chain_module]

The pre-rename #[fai_module] attribute is gone in SDK 0.3.0; the
dependency is tag-pinned so an SDK push can no longer change what
this module builds against. Rebuilt artifact where tracked.

Signed-off-by: flemming-it <sf@flemming.it>

README.md

@@ -41,7 +41,7 @@ The build depends on a sibling checkout of `fai/module-sdk`:
 ```
 ~/fai/
 ├── module_sdk/                 # cloned from fai/module-sdk
-└── fai_modules/
+└── chain_modules/
     └── text-extract/           # this repo
 ```