Fix generator paths in test schemas for CI

- Update generator provider paths from ./lib/generator.js to ../lib/generator.js
- Schemas run from tests/ directory so need relative path to project root
- Fixes CI failure where generator module could not be found
- Ensures tests work correctly when run from tests subdirectory

Author: omar-dulaimi

tests/schemas/basic.prisma

@@ -3,7 +3,7 @@ generator client {
 }
 
 generator class_validator {
-  provider = "node ./lib/generator.js"
+  provider = "node ../lib/generator.js"
   output   = "../generated/basic"
 }
 

tests/schemas/comprehensive.prisma

@@ -3,7 +3,7 @@ generator client {
 }
 
 generator class_validator {
-  provider = "node ./lib/generator.js"
+  provider = "node ../lib/generator.js"
   output   = "../generated/comprehensive"
 }