Is the Raspberry Pi Build HAT firmware in this repository stale?

When I run a minimal program that just instantiates a Raspberry Pi Build HAT `Brick` object, I get the following failure:

```
Unhandled exception. System.IO.IOException: BuildHat firmware signture error
at Iot.Device.BuildHat.Brick.GetBuildHatInformation()
at Iot.Device.BuildHat.Brick..ctor(String port, GpioController controller, Int32 reset, Boolean shouldDispose)
at Program.$(String[] args)
Aborted
```
This error happens even if the Build HAT firmware has already been loaded _e.g._ by the Python library. I conjecture that the firmware files included in the `Iot.Device.Bindings` NuGet package are incompatible with the current Raspberry Pi Build HAT boot loader. See the Build HAT firmware versions in this repository and the Python library repository at the very bottom of this issue submission.

**Steps to reproduce**

Build and run the following test program:

```csharp
using Iot.Device.BuildHat;

var brick = new Brick("/dev/ttyAMA0");
brick.Dispose();
```

**Expected behavior**

Program runs successfully.

**Actual behavior**

Program fails with error message above.

**Versions used**

Build machine `dotnet --info`:

```
.NET SDK:
Version: 9.0.302
Commit: bb2550b9af
Workload version: 9.0.300-manifests.183aaee6
MSBuild version: 17.14.13+65391c53b

Runtime Environment:
OS Name: Windows
OS Version: 10.0.26100
OS Platform: Windows
RID: win-x64
Base Path: C:\PROGRA~1\dotnet\sdk\9.0.302\

.NET workloads installed:
[wasm-tools]
Installation Source: VS 17.14.36301.6
Manifest Version: 9.0.7/9.0.100
Manifest Path: C:\PROGRA~1\dotnet\sdk-manifests\9.0.100\microsoft.net.workload.mono.toolchain.current\9.0.7\WorkloadManifest.json
Install Type: Msi

Configured to use loose manifests when installing new manifests.

Host:
Version: 9.0.7
Architecture: x64
Commit: 3c298d9f00

.NET SDKs installed:
5.0.202 [C:\PROGRA~1\dotnet\sdk]
6.0.100 [C:\PROGRA~1\dotnet\sdk]
9.0.302 [C:\PROGRA~1\dotnet\sdk]

.NET runtimes installed:
Microsoft.AspNetCore.All 2.1.30 [C:\PROGRA~1\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.App 2.1.30 [C:\PROGRA~1\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 5.0.4 [C:\PROGRA~1\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 5.0.5 [C:\PROGRA~1\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.0 [C:\PROGRA~1\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 6.0.5 [C:\PROGRA~1\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 8.0.18 [C:\PROGRA~1\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 9.0.7 [C:\PROGRA~1\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 2.1.30 [C:\PROGRA~1\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.4 [C:\PROGRA~1\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.5 [C:\PROGRA~1\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.0 [C:\PROGRA~1\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.5 [C:\PROGRA~1\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 6.0.12 [C:\PROGRA~1\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 8.0.18 [C:\PROGRA~1\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 9.0.7 [C:\PROGRA~1\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 5.0.4 [C:\PROGRA~1\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 5.0.5 [C:\PROGRA~1\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 6.0.0 [C:\PROGRA~1\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 6.0.5 [C:\PROGRA~1\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 8.0.18 [C:\PROGRA~1\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 9.0.7 [C:\PROGRA~1\dotnet\shared\Microsoft.WindowsDesktop.App]

Other architectures found:
arm64 [C:\Program Files\dotnet]
registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\arm64\InstallLocation]
x86 [C:\Program Files (x86)\dotnet]
registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\x86\InstallLocation]

Environment variables:
Not set

global.json file:
Not found

Learn more:
https://aka.ms/dotnet/info

Download .NET:
https://aka.ms/dotnet/download
```

Target machine `dotnet --info`:

```
Host:
Version: 9.0.7
Architecture: arm64
Commit: 3c298d9f00
RID: linux-arm64

.NET SDKs installed:
No SDKs were found.

.NET runtimes installed:
Microsoft.NETCore.App 9.0.7 [/usr/local/lib/dotnet/shared/Microsoft.NETCore.App]

Other architectures found:
None

Environment variables:
DOTNET_ROOT [/usr/local/lib/dotnet]

global.json file:
Not found

Learn more:
https://aka.ms/dotnet/info

Download .NET:
https://aka.ms/dotnet/download
```

Package versions:

```



```

Raspberry Pi Build HAT bootloader version:

```
BHBL> version
BuildHAT bootloader version 1631704133 2021-09-15T12:08:53+01:00
```

Build HAT firmware in the `dotnet/iot` repository:

```
~/iot/src/devices/BuildHat/data$ cat version ; md5sum -b *
1636109636
c86bb5fd7aeb34c93c774e142af2fdf3 *firmware.bin
c7529d660e16b6c3e162c33a25bdcc43 *signature.bin
c43ca26e77d995b579e8626e809e758a *version
```

Build HAT firmware in the Python library repository:

```
~/python-build-hat/buildhat/data$ cat version ; md5sum -b *
1737564117
711180af1a9c2535c2874e3104174bca *firmware.bin
12caf25acaf3fdd1046f483cb7f1957f *signature.bin
3d422c3562bbacab4fab45ff4c63a920 *version
```