build: don't use deprecated $(location) pre-declared variable (#36308)

$(location) is not recommended in the bazel docs as depending on context it will either return the value of $(execpath) or $(rootpath). rules_nodejs now supports $(rootpath) and $(execpath) in templated_args of nodejs_binary.

PR Close #36308

tools/saucelabs/BUILD.bazel

@@ -60,5 +60,5 @@ nodejs_binary(
         "@npm//shelljs",
     ],
     entry_point = "karma-saucelabs.js",
-    templated_args = ["$(location sauce-service.sh)"],
+    templated_args = ["$(rootpath sauce-service.sh)"],
 )