Release MakePay 1.7.2 DPoP registration fix

[orangebtc]

What changed

• send a signed DPoP proof when registering a native MakePay installation
• support the previous-key proof required for safe key rotation
• preserve the registered DPoP key across retries and disconnect/reconnect
• bump the plugin and package versions to 1.7.2
• add cryptographic request and reconnect regression tests

Root cause

Plugin 1.7.0 submitted a dpopJkt in the registration body but omitted the signed DPoP request header. MakeCrypto rejected the unproved key claim before authorization with invalid_dpop_proof.

Validation

• dotnet test BTCPayServer.Plugins.MakePay.Tests/BTCPayServer.Plugins.MakePay.Tests.csproj --configuration Release --verbosity minimal -m:1 (24 passed)
• Release build completed as part of the test run