ci: Raise the timeout multipliers for jobs that run in QEMU

For individual tests in dav1d-test-data, the default timeout
is 30 seconds (which is the Meson default if nothing is
specified). Previously it ran with a multiplier of 4, resulting
in a total timeout of 120 seconds.

When running tests in QEMU, exceeding this 120 second timeout
could happen occasionally. Raise the multiplier to 10, allowing
each individual job to run for up to 5 minutes.

This should hopefully reduce the amount of stray failures in the
CI.

For tests that already have a higher default timeout set, such
as checkasm which has got a 180 second default timeout, this results
in a much longer timeout period. However as long as we don't
frequently see issues where these actually hang, it should be
beneficial to just let them run to completion, rather than
aborting early due to a tight timeout.

.gitlab-ci.yml

@@ -740,7 +740,7 @@ test-debian-riscv64:
                             -Dtrim_dsp=false
                             --cross-file package/crossfiles/riscv64-linux.meson
         - ninja -C build
-        - cd build && time meson test -v --timeout-multiplier 4
+        - cd build && time meson test -v --timeout-multiplier 10
     variables:
         QEMU_LD_PREFIX: /usr/riscv64-linux-gnu/
     parallel:
@@ -762,7 +762,7 @@ test-debian-aarch64-qemu:
                             -Dtrim_dsp=false
                             --cross-file package/crossfiles/aarch64-linux.meson
         - ninja -C build
-        - cd build && time meson test -v --timeout-multiplier 4
+        - cd build && time meson test -v --timeout-multiplier 10
     variables:
         QEMU_LD_PREFIX: /usr/aarch64-linux-gnu/
     parallel:
@@ -808,7 +808,7 @@ test-debian-loongarch64:
                             -Dtrim_dsp=false
                             --cross-file package/crossfiles/loongarch64-linux.meson
         - ninja -C build
-        - cd build && time meson test -v --timeout-multiplier 4
+        - cd build && time meson test -v --timeout-multiplier 10
 
 .test-argon-script: &test-argon-script
         - meson setup build --buildtype release