feat(bazel): make RBE platform compatible with Bazel 6 (#2474)

This makes the RBE platform compatible with Bazel 6

Author: devversion

bazel/remote-execution/BUILD.bazel

@@ -5,8 +5,8 @@ package(default_visibility = ["//visibility:public"])
 platform(
     name = "platform",
     constraint_values = [
-        "@bazel_tools//platforms:linux",
-        "@bazel_tools//platforms:x86_64",
+        "@platforms//os:linux",
+        "@platforms//cpu:x86_64",
         "@bazel_tools//tools/cpp:clang",
     ],
     exec_properties = {

bazel/remote-execution/cpp/BUILD.bazel

@@ -18,13 +18,13 @@ cc_toolchain_suite(
 toolchain(
     name = "cc_toolchain",
     exec_compatible_with = [
-        "@bazel_tools//platforms:linux",
-        "@bazel_tools//platforms:x86_64",
+        "@platforms//os:linux",
+        "@platforms//cpu:x86_64",
         "@bazel_tools//tools/cpp:clang",
     ],
     target_compatible_with = [
-        "@bazel_tools//platforms:linux",
-        "@bazel_tools//platforms:x86_64",
+        "@platforms//os:linux",
+        "@platforms//cpu:x86_64",
     ],
     toolchain = ":cc_compiler_k8",
     toolchain_type = "@bazel_tools//tools/cpp:toolchain_type",