[202012][build] Fix isc-dhcp full version in rules.mk (#13288) #14376
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Why I did it
Cherry-picking #13288
How I did it
During the build process, a dsc file is retrieved from the URL: http://deb.debian.org/debian/pool/main/i/isc-dhcp/isc-dhcp_4.4.1-2.3.dsc
Depending on the DNS resolution, the server reached may respond with a HTTP 404 error code, what stops the build process. In all cases, the URL http://deb.debian.org/debian/pool/main/i/isc-dhcp/ no more lists this DSC file but one with a different format.
The suffix "+deb11u1" is now appended to identify the debian version.
How to verify it
Which release branch to backport (provide reason below if selected)
Description for the changelog
Ensure to add label/tag for the feature raised. example - PR#2174 under sonic-utilities repo. where, Generic Config and Update feature has been labelled as GCU.
Link to config_db schema for YANG module changes
A picture of a cute animal (not mandatory but encouraged)