Enable all aarch64 features in QEMU CI runner, except PAC (#3325)

* Enable all aarch64 features in QEMU CI runner, except PAC

* Upgrade QEMU version to 6.1.0

.github/workflows/main.yml

@@ -218,7 +218,7 @@ jobs:
     name: Test
     runs-on: ${{ matrix.os }}
     env:
-      QEMU_BUILD_VERSION: 6.0.0
+      QEMU_BUILD_VERSION: 6.1.0
     strategy:
       matrix:
         include:
@@ -234,7 +234,7 @@ jobs:
             qemu: qemu-aarch64 -L /usr/aarch64-linux-gnu
             qemu_target: aarch64-linux-user
             # FIXME(#3183) shouldn't be necessary to specify this
-            qemu_flags: -cpu cortex-a72
+            qemu_flags: -cpu max,pauth=off
     steps:
     - uses: actions/checkout@v2
       with: