Add dependency on openssl >= 3.3.1 to gemspec

[grekko]

I've been running into ssl issues recently.

…
cap aborted!
OpenSSL::SSL::SSLError: SSL_connect returned=1 errno=0 peeraddr=35.186.247.156:443 state=error: certificate verify failed (unable to get certificate CRL) (OpenSSL::SSL::SSLError)

Tasks: TOP => sentry:notice_deployment
(See full trace by running task with --trace)
The deploy has failed with an error: SSL_connect returned=1 errno=0 peeraddr=35.186.247.156:443 state=error: certificate verify failed (unable to get certificate CRL)

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I'm using openssl with version 3.6.0.

openssl --version
OpenSSL 3.6.0 1 Oct 2025 (Library: OpenSSL 3.6.0 1 Oct 2025)

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I've found this GitHub issue which lead me to the idea that this could help solve the aforementioned problem and it did.

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I haven't taken the time yet to fully understand my proposed change, so I'll have to leave this often as a draft (for now) and come back later to dig into the issue to provide more context.

[Nek-]

I tested this on my side and it's working just fine. It fixes #99

[phallstrom]

@Nek- Any issues if I merge this?