No files checked for current year

[tschmidtb51]

It looks like no files are checked if the csaf_checker should investigate the current year only.

Steps to reproduce:
Use the csaf_checker on a valid CSAF trusted provider with the option -t 2023.
If the -v option is used, it should result in listing the CSAF files retrieved.
However, no files were retrieved and also no signatures/hashes checked.

Tested with 3.0.0-beta1-g1

[s-l-teichmann]

The problem arises from the folder of year check and the constructed time interval by the -t flag.

-t 2023 creates a time interval from the beginning of the year and now. 2023 is not over now.

The folder year check tests if the last second of the year is in that interval. This is not the case so the advisory gets skipped.

The test has to be changed in a way to check if the whole years interval has an overlap with the time interval.

[s-l-teichmann]

PR #472 should fix this