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Update squid_nac.xml #1266

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Fixes filter being off and blocking youtube still
@JonathanDLee24
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@jim-p
Have you seen this small issue yet?

$sslproxy_options = "NO_SSLv3, NO_TLSv1, NO_TLSv1_1";

This variable is also used with 

tls_outgoing_options

However without the feature flags set TLS1 and TLS1_1 is being used, this can be seen inside of pcap files. This causes issues with websites sending change cipher requests. Please set this directive's feature flags to no longer use TLS1 or TLS1.1. This leaves TLS1.2 and TLS1.3 for use with the proxy. I have confirmed this forces use of TLS1.2 and TLS1.3. With this feature flag set TLS1 and 1.1 are no longer seen in pcap files when communicating with the proxy. The pcap files were generated inside of pfsense to find this issue.
JonathanDLee24 added a commit to JonathanDLee24/FreeBSD-ports that referenced this pull request Jul 12, 2024
This fixes the Squid youtube filter when being off it is still blocking YouTube.

Ref:

https://forum.netgate.com/topic/175759/youtube-content-getting-filtered-on-squid

https://redmine.pfsense.org/issues/13811

This is my first GitHub request, did I submit this correctly?

pfsense#1266
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