add apt update in deps.sh

[lcgogo]

if no apt update. apt install may failed like below

[?] This is fixed by the following command:
        apt-get install -y autoconf gettext automake autopoint flex bison build-essential gcc-multilib protobuf-compiler llvm lcov libgmp-dev libudev-dev cmake libclang-dev pkgconf
[?] Install missing system packages? (y/N) y
[+] Installing missing packages
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Package protobuf-compiler is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'protobuf-compiler' has no installation candidate
E: Unable to locate package llvm
E: Unable to locate package lcov
E: Unable to locate package libclang-dev

[jumpsiegel]

look at the error in the ci