fix(ci): correct tarpaulin exclude-files glob to match workspace paths

*/tests/* matches hsrs/tests/ and hsrs-codegen/tests/; also exclude
hsrs-codegen/src/main.rs (binary entry point, not exercised by tarpaulin).

Author: markovejnovic

tarpaulin.toml

@@ -1,4 +1,4 @@
 [default]
 workspace = true
 exclude = ["hsrs-macros"]
-exclude-files = ["tests/*"]
+exclude-files = ["*/tests/*", "hsrs-codegen/src/main.rs"]