Updates to various Fortinet appliances (FGT/FMG/FAZ)

[eantowne]

Updated:

fortigate.gns3a:

• Increased RAM to 2GB to account for modern version (>=7.0)
• Added versions: 6.4.14, 7.0.12, 7.2.6, 7.4.1
• Updated maintainer info

fortimanager.gns3a:

• Updated system requirements (8GB/4CPU) to reflect modern versions (7.0.x and up)
• Added versions: 6.4.14, 7.0.9, 7.2.4, 7.4.1
• Updated maintainer info

fortianalyzer.gns3a:

• Updated system requirements (16GB/4CPU) to reflect modern versions (7.0.x and up)
• Added versions: 6.4.14, 7.0.9, 7.2.4, 7.4.1
• Updated maintainer info

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When updating an existing appliance:

• [X] The new version is on top.
• [X] The filenames in the "images" section are unique, to avoid appliances / version overwriting each other.
• [X] If you forked the repo, running check.py doesn't drop any errors for the updated file.

[grossmj]

Welcome back :) Thanks 👍