[roll] Roll sdk-core CIPD packages:

fuchsia/sdk/core/linux-amd64 old:https://chrome-infra-packages.appspot.com/p/fuchsia/sdk/core/linux-amd64/+/version:0.20201219.3.1 new:https://chrome-infra-packages.appspot.com/p/fuchsia/sdk/core/linux-amd64/+/version:0.20201220.1.1
fuchsia/sdk/core/mac-amd64 old:https://chrome-infra-packages.appspot.com/p/fuchsia/sdk/core/mac-amd64/+/version:0.20201219.3.1 new:https://chrome-infra-packages.appspot.com/p/fuchsia/sdk/core/mac-amd64/+/version:0.20201220.1.1

From: version:0.20201219.3.1
To: version:0.20201220.1.1
GitOrigin-RevId: e1cbc716a00899ef877581440496018b4a8ef4bf
Change-Id: I8246ac7e79ab43ced9f7dd3a85c75a8768dfb644
diff --git a/jiri.lock b/jiri.lock
index afc3550..86cda9a 100644
--- a/jiri.lock
+++ b/jiri.lock
@@ -253,13 +253,13 @@
     },
     {
         "package": "fuchsia/sdk/core/linux-amd64",
-        "version": "version:0.20201219.3.1",
-        "instance_id": "AYMQOaZyz7JB6A0tWbIpRAsjqW63uwK0zWv-v_cGDQYC"
+        "version": "version:0.20201220.1.1",
+        "instance_id": "byrJ9URZUMnO3xUslrmIQT3-8kVMgxMPkmvxY1nlHMEC"
     },
     {
         "package": "fuchsia/sdk/core/mac-amd64",
-        "version": "version:0.20201219.3.1",
-        "instance_id": "VfUcjXjdZRaLv0SDaYZ8hIQE2F58Ci13onFs7pnFp-EC"
+        "version": "version:0.20201220.1.1",
+        "instance_id": "h_iq6T_cfxeKgs1TLv8DR0AgBhFedeUQcgOIPfp_hJEC"
     },
     {
         "package": "fuchsia/test_data/debug/sample_core",
diff --git a/prebuilts b/prebuilts
index ce37535..8b5a3e4 100644
--- a/prebuilts
+++ b/prebuilts
@@ -532,7 +532,7 @@
 
     <!-- Packages for SDK -->
     <package name="fuchsia/sdk/core/${platform}"
-             version="version:0.20201219.3.1"
+             version="version:0.20201220.1.1"
              platforms="linux-amd64,mac-amd64"
              path="prebuilt/sdk/core/{{.OS}}-{{.Arch}}"
              attributes="sdk"/>