Remove GnuTLS 3.5.5 from test dependencies

[goatgoose]

Security issue notifications

If you discover a potential security issue in s2n we ask that you notify
AWS Security via our vulnerability reporting page. Please do not create a public github issue.

Problem:

In #3207, GnuTLS 3.7.3 was added as a test dependency for the GnuTLS v2 integration tests. This version of GnuTLS, however, broke the v1 tests. So, both versions are being kept as dependencies temporarily. After all of v1 is removed from CI, GnuTLS 3.5.5 will no longer be needed.

Solution:

Remove GnuTLS 3.5.5 as a test dependency after the v2 integration tests replace the v1 tests.

Requirements / Acceptance Criteria:

What must a solution address in order to solve the problem? How do we know the solution is complete?

• RFC links: Links to relevant RFC(s)
• Related Issues: Link any relevant issues
• Will the Usage Guide or other documentation need to be updated?
• Testing: How will this change be tested? Call out new integration tests, functional tests, or particularly interesting/important unit tests.
  • Will this change trigger SAW changes? Changes to the state machine, the s2n_handshake_io code that controls state transitions, the DRBG, or the corking/uncorking logic could trigger SAW failures.
  • Should this change be fuzz tested? Will it handle untrusted input? Create a separate issue to track the fuzzing work.

Out of scope:

Is there anything the solution will intentionally NOT address?