`RuntimeError: Unique names are not defined for 2026 and beyond.`

[zacharyburnett]

found while testing #1168
https://github.com/spacetelescope/crds/actions/runs/20725816951/job/59501132466?pr=1168#step:7:110

now = datetime.datetime(2026, 1, 5, 19, 11, 8, 526831)

    def generate_timestamp(now=None):
    
        """Generate an enhanced CDBS-style uniqname."""
    
        if now is None:
            now = datetime.datetime.utcnow()
    
        if now.year < 2016:
            year = chr(now.year - 2015 + ord('z'))
        elif 2016 <= now.year <= 2025:
            year = chr(now.year - 2016 + ord('0'))
        else:
>           raise RuntimeError("Unique names are not defined for 2026 and beyond.")
E           RuntimeError: Unique names are not defined for 2026 and beyond.