Stop testing with Perl 5.10

More and more stuff on CPAN isn't installable on 5.10, so it's causing CI
failures.

Author: autarch

azure-pipelines.yml

@@ -14,7 +14,7 @@ stages:
     parameters:
       coverage: codecov
       debug: true
-      from_perl: "5.10"
+      from_perl: "5.12"
       extra_prereqs:
         - Mason::Tidy
         - Perl::Critic