Update verapdf-ignore.json

Author: Lucas-C

scripts/verapdf-ignore.json

@@ -5,6 +5,7 @@
         "6.1.3-2": "REASON: fpdf2 allows to create encrypted files",
         "6.2.3-1": "REASON: false positive - fpdf2 does not currently produce any ICCInputProfile",
         "6.2.3-2": "REASON: fpdf2 does not currently support PDF/A",
+        "6.2.3-3": "REASON: fpdf2 does not currently support PDF/A",
         "6.2.3-4": "REASON: fpdf2 does not currently support PDF/A",
         "6.3.4-1": "REASON: fpdf2 still allows using the PostScript standard 14 fonts. Quoting PDF 1.7 spec from 2006: Beginning with PDF 1.5, the special treatment given to the standard 14 fonts is deprecated. All fonts used in a PDF document should be represented using a com- plete font descriptor. For backwards capability, viewer applications must still provide the special treatment identified for the standard 14 fonts.",
         "6.3.5-3": "FIXME: corresponding GitHub issue -> https://github.com/PyFPDF/fpdf2/issues/88",