Remove command to install libhiredis deb file (sonic-net#2980)

libhiredis is now used as-is from the slave container, since we're not
making any changes to this package. See also
sonic-net/sonic-buildimage#15633.

Signed-off-by: Saikrishna Arcot <sarcot@microsoft.com>

azure-pipelines.yml

@@ -52,12 +52,11 @@ stages:
 
     - script: |
         set -xe
-        sudo apt-get -y purge libhiredis-dev libnl-3-dev libnl-route-3-dev || true
+        sudo apt-get -y purge libnl-3-dev libnl-route-3-dev || true
         sudo dpkg -i libnl-3-200_*.deb
         sudo dpkg -i libnl-genl-3-200_*.deb
         sudo dpkg -i libnl-route-3-200_*.deb
         sudo dpkg -i libnl-nf-3-200_*.deb
-        sudo dpkg -i libhiredis0.14_*.deb
         sudo dpkg -i libyang_1.0.73_amd64.deb
         sudo dpkg -i libyang-cpp_1.0.73_amd64.deb
         sudo dpkg -i python3-yang_1.0.73_amd64.deb