Add attestations by guggero for 28.1rc2 non-codesigned

[guggero]

No description provided.

[github-actions]

noncodesigned.SHA256SUMS summary for release 28.1rc2

User (see mapping below)            a b
aarch64-linux-gnu-debug.tar.gz      █ █
aarch64-linux-gnu.tar.gz            █ █
arm-linux-gnueabihf-debug.tar.gz    █ █
arm-linux-gnueabihf.tar.gz          █ █
arm64-apple-darwin-unsigned.tar.gz  █ █
arm64-apple-darwin-unsigned.zip     █ █
arm64-apple-darwin.tar.gz           █ █
powerpc64-linux-gnu-debug.tar.gz    █ █
powerpc64-linux-gnu.tar.gz          █ █
riscv64-linux-gnu-debug.tar.gz      █ █
riscv64-linux-gnu.tar.gz            █ █
win64-debug.zip                     █ █
win64-setup-unsigned.exe            █ █
win64-unsigned.tar.gz               █ █
win64.zip                           █ █
x86_64-apple-darwin-unsigned.tar.gz █ █
x86_64-apple-darwin-unsigned.zip    █ █
x86_64-apple-darwin.tar.gz          █ █
x86_64-linux-gnu-debug.tar.gz       █ █
x86_64-linux-gnu.tar.gz             █ █
bitcoin-28.1rc2.tar.gz              █ █

Details

Symbols:

• all hashes match: █
• missing hash: X
• hash mismatch: one of ◆, ▞, ▄, ▀, ▌, ▐, ▚

Username mapping:

• a: guggero
• b: achow101