[build]Update pool sonicbld to sonic-ububtu-1c since it's deprecated (#21)

[build]Update pool sonicbld to sonic-ububtu-1c since it's deprecated

Author: yejianquan

.azure-pipelines/build-template.yml

@@ -10,7 +10,7 @@ parameters:
 - name: pool
   type: string
   values:
-  - sonicbld
+  - sonicbld-1es
   - sonicbld-armhf
   - sonicbld-arm64
   - default

azure-pipelines.yml

@@ -26,7 +26,7 @@ stages:
   - template: .azure-pipelines/build-template.yml
     parameters:
       arch: amd64
-      pool: sonicbld
+      pool: sonicbld-1es
       sonic_slave: sonic-slave-${{ parameters.debian_version }}
       debian_version: ${{ parameters.debian_version }}
       artifact_name: sonic-dash-api