Arbitrary test timeout is too short for polkitbackendjsauthority

From a Debian x86_64 autobuilder log:

1/5 polkitunixusertest            OK              0.01s
2/5 polkitunixgrouptest           OK              0.01s
3/5 polkitunixnetgrouptest        OK              0.01s
4/5 polkitidentitytest            OK              0.01s
5/5 test-polkitbackendjsauthority OK             26.41s

This is uncomfortably close to Meson's 30s default timeout: even on x86, it would only take a small amount of extra load (or a slightly slower CPU?) to make this test time out. On slower CPU architectures like mips and riscv64, it does time out.

It would probably be a good idea to raise this timeout, perhaps to more like 2 minutes.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information