fix proxy-wasm-cpp-sdk (#2281)

plugins/wasm-cpp/.bazelrc

@@ -4,4 +4,6 @@ build:gcc --cxxopt=-std=c++17
 build:clang --action_env=CC=clang --action_env=CXX=clang++
 build:clang --action_env=BAZEL_COMPILER=clang
 build:clang --linkopt=-fuse-ld=lld
-build:clang --cxxopt=-std=c++17
+build:clang --cxxopt=-std=c++17
+
+build --incompatible_use_platforms_repo_for_constraints=false

plugins/wasm-cpp/.bazelversion

@@ -1 +1 @@
-5.4.0
+6.0.0

plugins/wasm-cpp/WORKSPACE

@@ -1,6 +1,13 @@
 workspace(name = "istio_ecosystem_wasm_extensions")
 
 load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+http_archive(
+    name = "platforms",
+    url = "https://github.com/bazelbuild/platforms/releases/download/0.0.9/platforms-0.0.9.tar.gz",
+    sha256 = "5eda539c841265031c2f82d8ae7a3a6490bd62176e0c038fc469eabf91f6149b",
+)
+
 load("//bazel:third_party.bzl", "wasm_extension_dependency")
 
 wasm_extension_dependency()
@@ -16,9 +23,9 @@ load("@io_bazel_rules_docker//repositories:deps.bzl", container_deps = "deps")
 
 container_deps()
 
-PROXY_WASM_CPP_SDK_SHA = "eaec483b5b3c7bcb89fd208b5a1fa5d79d626f61"
+PROXY_WASM_CPP_SDK_SHA = "0ceca8c81dddc4c9875cf0cb997454764905658c"
 
-PROXY_WASM_CPP_SDK_SHA256 = "1140bc8114d75db56a6ca6b18423d4df50d988d40b4cec929a1eb246cf5a4a3d"
+PROXY_WASM_CPP_SDK_SHA256 = "cb010b242d49fb02b39124421b6acb69bd4ece64fb6299ba3f98f3b36eef7004"
 
 http_archive(
     name = "proxy_wasm_cpp_sdk",