[hotfix] signald: catch common exceptions thrown when channels crash

update our build to track this MR in our signald fork:

• signald-fork!15 (merged)

whose message is:

• this MR colllects all the most common exceptions we see in the logs when a channel crashes and catches them, in the (small) hope, this might reduce crashes
• we will try running this week for a week and see!

ie, pin our signald container to:

• REPO_URL "https://0xacab.org/team-friendo/signald-fork.git"
• BRANCH "master"
• OMMIT_HASH "6c2d9e63d38a2a3731445fd97641cd9a4d0e528c"

and label this container:

• verson="1.0.3"