Update data for JPEG logo

[gizmecano]

• Issue: Request: Joint Photographic Experts Group (JPEG) #3301 and Add JPEG #3303
• Alexa rank: circa 447,000 (august 2021)

Checklist

• I updated the JSON data in _data/simple-icons.json
• I optimized the icon with SVGO or SVGOMG
• The SVG viewbox is 0 0 24 24

Description

As the source of the file is not set explicitly on the contact page, the link seems to be updatable by pointing to the mentioned downloadable file rather than the page in question.

In addition, this downloadable file contains a document entitled "license_agreement.pdf" which specifies the license in its Terms and conditions section, alinea b:

b. The owner grants perpetual, non-transferrable, non-exclusive usage of the JPEG logo to any person and/or legal entity under the “Creative Commons Attribution-NoDerivatives 4.0 International License”.

However, since this file is included in a downloadable file, it seems inappropriate to add a direct link to the license.

[jorgeamadosoria]

The source change is too specific. This is vulnerable to changes on JPEG side that would render the source obsolete.
The addition of the license is fine, but I would revert the source to the original value

[jorgeamadosoria]

@gizmecano Can you please update the branch? When the branch is updated to the base branch we can merge this PR 👍