Update Bazel to v5.2.0. (proxy-wasm#298)

Signed-off-by: Piotr Sikora <[email protected]>

Author: PiotrSikora

.bazelversion

@@ -1 +1 @@
-5.0.0
+5.2.0

.github/workflows/test.yml

@@ -214,7 +214,7 @@ jobs:
           arch: s390x
           action: test
           flags: --config=clang --test_timeout=1800
-          run_under: docker run --rm --env HOME=$HOME --env USER=$(id -un) --volume "$HOME:$HOME" --workdir $(pwd) --user $(id -u):$(id -g) --platform linux/s390x piotrsikora/build-tools:bazel-5.0.0-clang-13-gcc-11
+          run_under: docker run --rm --env HOME=$HOME --env USER=$(id -un) --volume "$HOME:$HOME" --workdir $(pwd) --user $(id -u):$(id -g) --platform linux/s390x piotrsikora/build-tools:bazel-5.2.0-clang-14-gcc-12
           cache: true
         - name: 'Wasmtime on macOS/x86_64'
           engine: 'wasmtime'