ci: fix test job

ubuntu 22.04 was failing to run electrum.AppImage with the following error:

dlopen(): error loading libfuse.so.2
AppImages require FUSE to run.

Fix by installing libfuse2

Author: delta1

.github/workflows/rust.yml

@@ -22,6 +22,7 @@ jobs:
   test:
     runs-on: ubuntu-22.04
     steps:
+    - run: sudo apt-get update && sudo apt-get install libfuse2
     - uses: actions/checkout@v4
     - uses: dtolnay/rust-toolchain@1.75.0
     - uses: Swatinem/rust-cache@v2