Update to latest boringssl chromium-stable commit (#847)

Motivation:

The chromium-stable branch of boringssl has new commits. We should pull
them in.

Modifications:

Change commit sha of boringssl to the latest

Result:

Use latest code of chromium-stable branch

pom.xml

@@ -88,7 +88,7 @@
     <!--
       See https://boringssl.googlesource.com/boringssl/+/refs/heads/chromium-stable for the latest commit
     -->
-    <boringsslCommitSha>dd5219451c3ce26221762a15d867edf43b463bb2</boringsslCommitSha>
+    <boringsslCommitSha>1b7fdbd9101dedc3e0aa3fcf4ff74eacddb34ecc</boringsslCommitSha>
     <libresslVersion>3.4.3</libresslVersion>
     <!--
       See https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/SHA256 for the SHA256 signature