MFH: r458873

www/waterfox: update to 56.0.3

• Apply more FF58 fixes [1]

Changes: https://github.com/MrAlex94/Waterfox/compare/56.0.2...56.0.3
Security: a891c5b4-3d7a-4de9-9c71-eef3fd698c77 [1]
Approved by: ports-secteam blanket