Bump P4Runtime to v1.2.0

Change-Id: I9f5b4c8a4b62865c24ecfe9eb91e7e688523a9c5
diff --git a/tools/build/bazel/p4lang_workspace.bzl b/tools/build/bazel/p4lang_workspace.bzl
index 82d9a80..4629257 100644
--- a/tools/build/bazel/p4lang_workspace.bzl
+++ b/tools/build/bazel/p4lang_workspace.bzl
@@ -1,7 +1,7 @@
 load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 
-P4RUNTIME_VER = "1.0.0"
-P4RUNTIME_SHA = "667464bd369b40b58dc9552be2c84e190a160b6e77137b735bd86e5b81c6adc0"
+P4RUNTIME_VER = "1.2.0"
+P4RUNTIME_SHA = "0fce7e06c63e60a8cddfe56f3db3d341953560c054d4c09ffda0e84476124f5a"
 
 def generate_p4lang():
     http_archive(