Extend test cert to 2049

This change makes tests pass in 2035
Background:
As part of my work on reproducible builds for openSUSE, I check that software still gives identical build results in the future.
The usual offset is +15 years, because that is how long I expect some software will be used in some places.
This showed up failing tests in our package build.

See https://reproducible-builds.org/ for why this matters.

tests/test_server.crt

@@ -2,7 +2,7 @@
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@@ -13,11 +13,11 @@ Lvc6cJHMKaxHCeIBOL+z/9kJqhh30eqsmNB5AXSoV8b2B3MV3glW2vd5WJVYEWxl
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-ZDfUrsbY
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+XAW8Yf8H
 -----END CERTIFICATE-----