[Bug]: Sources should use deb822 with Signed-by

[joshtriplett]

~$ pkg up
Hit:1 https://termux.net stable InRelease
2 packages can be upgraded. Run 'apt list --upgradable' to see them.
Notice: Missing Signed-By in the sources.list(5) entry for 'https://termux.net'
Notice: Consider migrating all sources.list(5) entries to the deb822 .sources format
Notice: The deb822 .sources format supports both embedded as well as external OpenPGP keys
Notice: See apt-secure(7) for best practices in configuring repository signing.

System information

Termux Variables:
TERMUX_EXEC__PROC_SELF_EXE=/data/data/com.termux/files/usr/bin/termux-info
TERMUX_VERSION=googleplay.2025.01.18
TERMUX__USER_ID=0
Packages CPU architecture:
aarch64
Subscribed repositories:
# sources.list
deb https://termux.net stable main
Updatable packages:
All packages up to date
termux-tools version:
3.0.8
Android version:
15
Kernel build information:
Linux localhost 6.1.84-android14-11-g5c500deec3a7-ab12418271 #1 SMP PREEMPT Thu Sep 26 10:25:24 UTC 2024 aarch64 Android
Device manufacturer:
Google
Device model:
Pixel 9 Pro Fold
LD Variables:
LD_LIBRARY_PATH=
LD_PRELOAD=/data/data/com.termux/files/usr/lib/libtermux-exec.so
Installed termux plugins:
com.termux.widget versionCode:14
com.termux.styling versionCode:34