build: update openssl config generator Dockerfile

The `deps/openssl/config/generate_headers.pl` imports `Text::Template`
but that Perl module is not present in the default Perl installation in
the Dockerfile and needs to be explicitly installed.

PR-URL: #41177
Refs: quictls/openssl#69
Refs: https://mta.openssl.org/pipermail/openssl-announce/2021-December/000212.html
Reviewed-By: Danielle Adams <adamzdanielle@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Derek Lewis <DerekNonGeneric@inf.is>

deps/openssl/config/Dockerfile

@@ -7,6 +7,7 @@ RUN buildDeps='binutils build-essential vim nasm git' \
   && apt-get install -y --no-install-recommends --force-yes $buildDeps \
   && apt-get clean \
   && apt-get autoremove -y \
+  && cpan install Text::Template \
   && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
 WORKDIR /node