Fix year-dependent VRL tests

[bruceg]

With vectordotdev/vector#15797 we applied a bandaid to the two year-dependent VRL tests, parse_klog and parse_linux_authorization, but they will again fail next year if nothing is changed. This needs to be resolved so we don't continue to have yearly issues with these tests.

[pront]

Sample output from https://github.com/kubernetes/klog/blob/main/examples/log_file/usage_log_file.go:

Log file created at: 2025/01/02 13:41:35
Running on machine: COMP-LPF0JYPP2Q
Binary: Built with gc go1.23.4 for darwin/arm64
Log line format: [IWEF]mmdd hh:mm:ss.uuuuuu threadid file:line] msg
I0102 13:41:35.886784   42875 usage_log_file.go:17] nice to meet you
Log file created at: 2025/01/02 13:41:37
Running on machine: COMP-LPF0JYPP2Q
Binary: Built with gc go1.23.4 for darwin/arm64
Log line format: [IWEF]mmdd hh:mm:ss.uuuuuu threadid file:line] msg
I0102 13:41:37.379107   42902 usage_log_file.go:17] nice to meet you

Year is not included. I wonder if creating a timestamp with the current year is the wrong thing here.