Update Bazel to v4.0.0. (#90)

Signed-off-by: Piotr Sikora <piotrsikora@google.com>

Author: PiotrSikora

.bazelversion

@@ -1 +1 @@
-2.0.0
+4.0.0

bazel/dep/deps.bzl

@@ -39,19 +39,19 @@ def wasm_dependencies():
 
     _http_archive(
         name = "rules_proto",
-        sha256 = "602e7161d9195e50246177e7c55b2f39950a9cf7366f74ed5f22fd45750cd208",
-        strip_prefix = "rules_proto-97d8af4dc474595af3900dd85cb3a29ad28cc313",
+        sha256 = "9fc210a34f0f9e7cc31598d109b5d069ef44911a82f507d5a88716db171615a8",
+        strip_prefix = "rules_proto-f7a30f6f80006b591fa7c437fe5a951eb10bcbcf",
         urls = [
-            "https://mirror.bazel.build/github.com/bazelbuild/rules_proto/archive/97d8af4dc474595af3900dd85cb3a29ad28cc313.tar.gz",
-            "https://github.com/bazelbuild/rules_proto/archive/97d8af4dc474595af3900dd85cb3a29ad28cc313.tar.gz",
+            "https://mirror.bazel.build/github.com/bazelbuild/rules_proto/archive/f7a30f6f80006b591fa7c437fe5a951eb10bcbcf.tar.gz",
+            "https://github.com/bazelbuild/rules_proto/archive/f7a30f6f80006b591fa7c437fe5a951eb10bcbcf.tar.gz",
         ],
     )
 
     _http_archive(
         name = "com_google_protobuf",
-        sha256 = "59621f4011a95df270748dcc0ec1cc51946473f0e140d4848a2f20c8719e43aa",
-        strip_prefix = "protobuf-655310ca192a6e3a050e0ca0b7084a2968072260",
-        url = "https://github.com/protocolbuffers/protobuf/archive/655310ca192a6e3a050e0ca0b7084a2968072260.tar.gz",
+        sha256 = "6dd0f6b20094910fbb7f1f7908688df01af2d4f6c5c21331b9f636048674aebf",
+        strip_prefix = "protobuf-3.14.0",
+        url = "https://github.com/protocolbuffers/protobuf/releases/download/v3.14.0/protobuf-all-3.14.0.tar.gz",
     )
 
 def _http_archive(name, **kwargs):