Update main signing keys on Archweb: add diabonas, remove allan

Please update the information on https://archlinux.org/master-keys/ as follows:

Add diabonas's main key

• Main key fingerprint: 75BD80E4D834509F6E740257B1B73B02CC52A02A
• Owner: Jonas Witschel (diabonas)
• Owner's signing key: FE2E6249201CA54A4FB90D066E80CA1446879D04
• Revoker: Frederik Schwan (freswa)
• Revoker's signing key: 05C7775A9E8B977407FE08E69D4C5AA15426DA0A

Sources:

• archlinux-keyring#176 (closed)
• archlinux-keyring!101 (merged)
• archlinux-keyring@42ca7f2c

Remove allan's main key

• Main key fingerprint: AB19265E5D7D20687D303246BA1DFB64FFF979E7
• Owner: Allan McRae (allan)
• Owner's signing key: 6645B0A8C7005E78DB1D7864F99FFE0FEAE999BD
• Revoker: Dave Reisner (dreisner)
• Revoker's signing key: 487EACC08557AD082088DABA1EB2638FF56C0C53

Sources:

• archlinux-keyring#148 (closed)
• archlinux-keyring!86 (closed)
• archlinux-keyring@f3b1e9e5

These changes are implemented in the freshly released version 20220713-1 of the archlinux-keyring package, so the machine running Archweb probably needs an update first.