bazel_{3,4,5}: Use arm64 as arch suffix on aarch64

The official bazel wrapper script uses `$(uname -s | tr '[:upper:]' '[:lower:]')-$(uname -m)`
as the `os-arch` suffix.

On aarch64 Darwin, `uname -m` returns "arm64", on aarch64 Linux it returns "aarch64".

pkgs/development/tools/build-managers/bazel/bazel_3/default.nix

@@ -110,7 +110,9 @@ let
   # and libraries path.
   # We prefetch it, patch it, and override it in a global bazelrc.
   system = if stdenv.hostPlatform.isDarwin then "darwin" else "linux";
-  arch = stdenv.hostPlatform.parsed.cpu.name;
+
+  # on aarch64 Darwin, `uname -m` returns "arm64"
+  arch = with stdenv.hostPlatform; if isDarwin && isAarch64 then "arm64" else parsed.cpu.name;
 
   remote_java_tools = stdenv.mkDerivation {
     name = "remote_java_tools_${system}";

pkgs/development/tools/build-managers/bazel/bazel_4/default.nix

@@ -135,7 +135,9 @@ let
   # and libraries path.
   # We prefetch it, patch it, and override it in a global bazelrc.
   system = if stdenv.hostPlatform.isDarwin then "darwin" else "linux";
-  arch = stdenv.hostPlatform.parsed.cpu.name;
+
+  # on aarch64 Darwin, `uname -m` returns "arm64"
+  arch = with stdenv.hostPlatform; if isDarwin && isAarch64 then "arm64" else parsed.cpu.name;
 
   remote_java_tools = stdenv.mkDerivation {
     name = "remote_java_tools_${system}";

pkgs/development/tools/build-managers/bazel/bazel_5/default.nix

@@ -126,7 +126,9 @@ let
   platforms = lib.platforms.linux ++ lib.platforms.darwin;
 
   system = if stdenv.hostPlatform.isDarwin then "darwin" else "linux";
-  arch = stdenv.hostPlatform.parsed.cpu.name;
+
+  # on aarch64 Darwin, `uname -m` returns "arm64"
+  arch = with stdenv.hostPlatform; if isDarwin && isAarch64 then "arm64" else parsed.cpu.name;
 
   bazelRC = writeTextFile {
     name = "bazel-rc";