community/libapk-qt: skip failing tests on riscv64 and loongarch64

Skip tests inapplicable to loongarch64 that led to rebuild failure on the loongarch64 builder.

Errors:

3/9 Test #3: test_db_update ...................***Failed    0.17 sec
WARNING: opening from cache https://dl-cdn.alpinelinux.org/alpine/v3.19/main: No such file or directory
WARNING: opening from cache https://dl-cdn.alpinelinux.org/alpine/v3.19/community: No such file or directory
OK: DB was opened!
fetch https://dl-cdn.alpinelinux.org/alpine/v3.19/main/loongarch64/APKINDEX.tar.gz
qtapk: Fetch failed [ https://dl-cdn.alpinelinux.org/alpine/v3.19/main ]:  No such file or directory
fetch https://dl-cdn.alpinelinux.org/alpine/v3.19/community/loongarch64/APKINDEX.tar.gz
qtapk: Fetch failed [ https://dl-cdn.alpinelinux.org/alpine/v3.19/community ]:  No such file or directory
WARNING: Failed to update DB!

    Start 4: test_add
4/9 Test #4: test_add .........................***Failed    0.17 sec
WARNING: opening from cache https://dl-cdn.alpinelinux.org/alpine/v3.19/main: No such file or directory
WARNING: opening from cache https://dl-cdn.alpinelinux.org/alpine/v3.19/community: No such file or directory
OK: DB was opened!
fetch https://dl-cdn.alpinelinux.org/alpine/v3.19/main/loongarch64/APKINDEX.tar.gz
qtapk: Fetch failed [ https://dl-cdn.alpinelinux.org/alpine/v3.19/main ]:  No such file or directory
fetch https://dl-cdn.alpinelinux.org/alpine/v3.19/community/loongarch64/APKINDEX.tar.gz
qtapk: Fetch failed [ https://dl-cdn.alpinelinux.org/alpine/v3.19/community ]:  No such file or directory
WARNING: Failed to update DB!