Conan-center-index: [request] Update packages to latest version of OpenSSL

[danimtb]

Coming from #526

OpenSSL 1.0.2 will be end of life on 2019-12-31.
OpenSSL 1.1.0 is end of life since 2019-09-11

Whenever we can we should migrate packages to use OpenSSL 1.1.1

We should check and update the recipes in the index to use the latest OpenSSL version if possible

[Croydon]

No CCI recipe uses 1.1.0 anymore. The remaining use of the 1.0.2 version series is the following:

Recipe | OpenSSL version | Upgraded to 1.1.1 after creating this list
---- | ------ | ----------
botan/all | 1.0.2u | ❌
libpq/all | 1.0.2t | ✔️ - PR #1620
mysql-connector-c/all | 1.0.2u | ❌
poco/all | 1.0.2t | ✔️ - PR #1536
dcmtk/all | 1.0.2u | ❌

[prince-chrismc]

Does not seem to be a recipe using 1.0.2t

There's a few on 1.0.2u

[Croydon]

I updated the list