[arm64][qemu] upgrade qemu to 6.1.0-8 for fix systemd-sonic-generator compile error (#9320)

for compile error when build systemd-sonic-generator_1.0.0_arm64.deb on qemu arm64 bullseye.
```
boost::filesystem::copy_file: Function not implemented: "tests/testfiles/single_inst.service", "tests/ssg-test/systemd/single_inst.service"
boost::filesystem::copy_file: Function not implemented: "tests/testfiles/multi_inst_b.service", "tests/ssg-test/systemd/multi_inst_b.service"
boost::filesystem::copy_file: Function not implemented: "tests/testfiles/multi_inst_a.service", "tests/ssg-test/systemd/multi_inst_a.service"
boost::filesystem::copy_file: Function not implemented: "tests/testfiles/multi_inst_b@.service", "tests/ssg-test/systemd/multi_inst_b@.service"
boost::filesystem::copy_file: Function not implemented: "tests/testfiles/multi_inst_a@.service", "tests/ssg-test/systemd/multi_inst_a@.service"
boost::filesystem::copy_file: Function not implemented: "tests/testfiles/test.timer", "tests/ssg-test/systemd/test.timer"
boost::filesystem::copy_file: Function not implemented: "tests/testfiles/test.service", "tests/ssg-test/systemd/test.service"
ssg-test.cc:244: Failure
Expected equality of these values:
  fs::exists(path)
    Which is: false
  expected_result
    Which is: true
Failed validation: "tests/ssg-test/generator/multi-user.target.wants/multi_inst_b.service"
```

Co-authored-by: shil <shil@centecnetworks.com>

sonic-slave-bullseye/Dockerfile.j2

@@ -3,7 +3,7 @@ FROM multiarch/qemu-user-static:x86_64-arm-5.2.0-2 as qemu
 FROM multiarch/debian-debootstrap:armhf-bullseye
 COPY --from=qemu /usr/bin/qemu-arm-static /usr/bin
 {%- elif CONFIGURED_ARCH == "arm64" and MULTIARCH_QEMU_ENVIRON == "y" %}
-FROM multiarch/qemu-user-static:x86_64-aarch64-5.2.0-2 as qemu
+FROM multiarch/qemu-user-static:x86_64-aarch64-6.1.0-8 as qemu
 FROM multiarch/debian-debootstrap:arm64-bullseye
 COPY --from=qemu /usr/bin/qemu-aarch64-static /usr/bin
 {%- else -%}