fix: lpac submodule (#206)

```
Fetching submodule libs/lpac-jni/src/main/jni/lpac
remote: Repository not found.
fatal: repository 'https://github.com/estkme/lpac/' not found
Errors during submodule fetch:
	libs/lpac-jni/src/main/jni/lpac
```

Reviewed-on: https://gitea.angry.im/PeterCxy/OpenEUICC/pulls/206
Co-authored-by: septs <github@septs.pw>
Co-committed-by: septs <github@septs.pw>

.gitmodules

@@ -1,3 +1,3 @@
 [submodule "libs/lpac-jni/src/main/jni/lpac"]
 	path = libs/lpac-jni/src/main/jni/lpac
-	url = https://github.com/estkme/lpac
+	url = https://github.com/estkme-group/lpac.git