Log Message:
Update to 2.047

Upstream changes:
2.047     2024-05-18

    - Fixed implementation of GH-77.

    - Added $pdf->standard_fonts() and $pdf->is_standard_font($name) (initial
      patch by Johan Vromans).

2.046     2024-05-14

    - [GH-74] Fixed documentation error saying that stroke_color and fill_color
      can be chained.

    - Crash instead of freezing if a PDF trailer's Prev keys result in a loop or
      if multiple trailers use the same object ID and generation number.

    - [GH-70] Fix off-by-one error when adding a page at the beginning of a PDF.

    - [GH-77] Significantly improve performance when adding many pages to a PDF.