bpo-29572: Update macOS installer build to OpenSSL 1.0.2k (#457) (#2836)

(cherry picked from commit cfcd76777e35c83d548d8736f5d7dc92fe56d806)
diff --git a/Mac/BuildScript/build-installer.py b/Mac/BuildScript/build-installer.py
index e8272e7..c7b2e8c 100755
--- a/Mac/BuildScript/build-installer.py
+++ b/Mac/BuildScript/build-installer.py
@@ -242,9 +242,9 @@
 
         result.extend([
           dict(
-              name="OpenSSL 1.0.2j",
-              url="https://www.openssl.org/source/openssl-1.0.2j.tar.gz",
-              checksum='96322138f0b69e61b7212bc53d5e912b',
+              name="OpenSSL 1.0.2k",
+              url="https://www.openssl.org/source/openssl-1.0.2k.tar.gz",
+              checksum='f965fc0bf01bf882b31314b61391ae65',
               patches=[
                   "openssl_sdk_makedepend.patch",
                    ],