qemu: upgrade Cortex-A72 to Cortex-A76

Cortex-A76 supports ARMv8.2-A, while Cortex-A72 only supports ARMv8-A.

ARMv8-A is not enough to run AmazonLinux 2023:
```
$ docker run -it --rm  public.ecr.aws/amazonlinux/amazonlinux:2023
Fatal glibc error: This version of Amazon Linux requires a newer ARM64 processor
                   compliant with at least ARM architecture 8.2-a with Cryptographic
                   extensions. On EC2 this is Graviton 2 or later.
```

Cortex-A76 is available since QEMU 7.1 (Aug 2022).

Signed-off-by: Akihiro Suda <[email protected]>

Author: AkihiroSuda

Diff for: pkg/limayaml/defaults.go

@@ -56,7 +56,7 @@ var (
 
 func defaultCPUType() CPUType {
 	cpuType := map[Arch]string{
-		AARCH64: "cortex-a72",
+		AARCH64: "cortex-a76", // available since QEMU 7.1 (Aug 2022)
 		ARMV7L:  "cortex-a7",
 		// Since https://github.com/lima-vm/lima/pull/494, we use qemu64 cpu for better emulation of x86_64.
 		X8664:   "qemu64",

Diff for: templates/default.yaml

@@ -314,7 +314,7 @@ os: null
 # Setting of instructions is supported like this: "qemu64,+ssse3".
 # 🟢 Builtin default: hard-coded arch map with type (see the output of `limactl info | jq .defaultTemplate.cpuType`)
 cpuType:
-#   aarch64: "cortex-a72" # (or "host" when running on aarch64 host)
+#   aarch64: "cortex-a76" # (or "host" when running on aarch64 host)
 #   armv7l: "cortex-a7" # (or "host" when running on armv7l host)
 #   riscv64: "rv64" # (or "host" when running on riscv64 host)
 #   x86_64: "qemu64" # (or "host,-pdpe1gb" when running on x86_64 host)

Diff for: website/content/en/docs/installation/_index.md

@@ -9,7 +9,7 @@ Supported host OS:
 - Windows (untested)
 
 Prerequisite:
-- QEMU 7.0 or later (Required, only if QEMU driver is used)
+- QEMU 7.1 or later (Required, only if QEMU driver is used)
 
 {{< tabpane text=true >}}