mbedtls: support TLS 1.3

[MAntoniak]

See #12876.

Question, where in the documentation can I write down the information that the required version of the mbedtls library is 3.6.0?
Should the tests be modified?

[bagder]

Question, where in the documentation can I write down the information that the required version of the mbedtls library is 3.6.0?

docs/INTERNALS.md lists minimum version of multiple dependencies. But is that really the required version? If so, should we not make the build/configure/cmake fail if we try to build with a too old version?

Should the tests be modified?

It seems http/test_17_ssl_use.py needs a poke.

[MAntoniak]

docs/INTERNALS.md lists minimum version of multiple dependencies. But is that really the required version? If so, should we not make the build/configure/cmake fail if we try to build with a too old version?

I have thought through the topic of documentation and indeed there is no need to include information about the required version of mbedtls to support TLSv1.3. Version 3.6.0 is the first version which TLSv1.3 is not experimental, it is available by defaut.

[bagder]

Thanks!

[MAntoniak]

Wow thank you for quick approval of this PR.

I changed the file test_17_ssl_use.py, but I see in the Linux/mbedtls test this line:
tests/http/test_17_ssl_use.py::TestSSLUse::test_17_02_sslinfo_reconnect[0-1.3] SKIPPED [ 94%]

Also, in cache mbedtls stage, I see:
Cache restored from key: Linux-build-cache-mbedtls-mbedtls-v3.5.0

Is it possible to upgrade the version to 3.6.0?
Is it enough to change the version in the linux.yml file?