Renormalize line endings

We should have consistent line endings in our repository; now that we
have a .gitattributes file, update the repository contents to match
expectations.

ci/properties/c-cpp.properties.json

@@ -1,6 +1,6 @@
-{
-    "name": "C/C++ with Make",
-    "description": "Build and test a C/C++ project using Make.",
-    "iconName": "c-cpp",
-    "categories": ["C", "C++"]
-}
+{
+    "name": "C/C++ with Make",
+    "description": "Build and test a C/C++ project using Make.",
+    "iconName": "c-cpp",
+    "categories": ["C", "C++"]
+}