Update Quarterly Filing Graphic with 2026 Dates

[chynnakeys]

New dates for 2026 are as follows:

Graphic is found under FAQ -> HMDA Data Collection Timelines -> Quarterly Filing Period Dates.

Graphic is also found under the graphs tool

#2301 shows an example of what was done in the past.

[chynnakeys]

Additionally, and I don't know if this is a separate item, but when Q1 2026 filing opens next year, this page should be updated: https://ffiec.cfpb.gov/filing/2025-Q2/

[billhimmelsbach]

I'll add this to the updating the FIG docs too. 📝

[billhimmelsbach]

@contolini