[ci] Enable the ruff rule requiring explicit encoding on text file I/O (#17897)

script/check_import_time.py

@@ -194,7 +194,7 @@ def cmd_update(args: argparse.Namespace) -> int:
 
 
 def cmd_har_only(args: argparse.Namespace) -> int:
-    Path(args.har).write_text(run_waterfall(TARGET_MODULE))
+    Path(args.har).write_text(run_waterfall(TARGET_MODULE), encoding="utf-8")
     print(f"Wrote waterfall HAR to {args.har}")
     return 0
 

script/ci_memory_impact_extract.py

@@ -269,7 +269,7 @@ def main() -> int:
     if args.output_build_dir and build_dir:
         build_dir_path = Path(args.output_build_dir)
         build_dir_path.parent.mkdir(parents=True, exist_ok=True)
-        build_dir_path.write_text(build_dir)
+        build_dir_path.write_text(build_dir, encoding="utf-8")
         print(f"Wrote build directory to {args.output_build_dir}", file=sys.stderr)
 
     # Run detailed analysis if build directory available

script/setup_codspeed_lib.py

@@ -84,7 +84,7 @@ def _read_codspeed_version(cmake_path: Path) -> str:
     """Extract CODSPEED_VERSION from core/CMakeLists.txt."""
     if not cmake_path.exists():
         return "0.0.0"
-    for line in cmake_path.read_text().splitlines():
+    for line in cmake_path.read_text(encoding="utf-8").splitlines():
         if line.startswith("set(CODSPEED_VERSION"):
             return line.split()[1].rstrip(")")
     return "0.0.0"

script/test_build_components.py

@@ -367,7 +367,7 @@ def run_esphome_test(
     output_file = build_dir / f"{component}.{test_name}.{platform_with_version}.yaml"
 
     # Copy base file and substitute component test file reference
-    base_content = base_file.read_text()
+    base_content = base_file.read_text(encoding="utf-8")
     # Get relative path from build dir to test file
     repo_root = Path(__file__).parent.parent
     component_test_ref = f"../../{test_file.relative_to(repo_root / 'tests')}"
@@ -524,7 +524,7 @@ def run_grouped_test(
 
     # Create test file that includes merged config
     output_file = build_dir / f"test_{group_name}.{platform_with_version}.yaml"
-    base_content = base_file.read_text()
+    base_content = base_file.read_text(encoding="utf-8")
     merged_ref = merged_config_file.name
     output_content = base_content.replace("$component_test_file", merged_ref)
     output_file.write_text(output_content)