The "Card Expiry Date" is automatically updated from the "Expiry MMYYYY" field.
You can use Data Loader of similar to update the "Expiry MMYYYY" and that will set the "Card Expiry Date" to the last day in the month from this field.
MM is the Month
YYYYY is the Year.
NOTE, this must be exactly 6 characters long. If updating for May 2022, then enter "052022" and NOT "52022". Ie. this field must have the leading "0" for months 1...9.