fix: allow named pipe protocol support for ARM64 Windows

[niallnsec]

Currently builds for Windows ARM64 fail with the following errors:

# github.com/microsoft/go-mssqldb/internal/gopkg.in/natefinch/npipe.v2
/go/pkg/mod/github.com/microsoft/[email protected]/internal/gopkg.in/natefinch/npipe.v2/npipe_windows.go:191:16: undefined: createEvent
/go/pkg/mod/github.com/microsoft/[email protected]/internal/gopkg.in/natefinch/npipe.v2/npipe_windows.go:207:8: undefined: getOverlappedResult
/go/pkg/mod/github.com/microsoft/[email protected]/internal/gopkg.in/natefinch/npipe.v2/npipe_windows.go:224:12: undefined: waitNamedPipe
/go/pkg/mod/github.com/microsoft/[email protected]/internal/gopkg.in/natefinch/npipe.v2/npipe_windows.go:329:8: undefined: connectNamedPipe
/go/pkg/mod/github.com/microsoft/[email protected]/internal/gopkg.in/natefinch/npipe.v2/npipe_windows.go:371:10: undefined: disconnectNamedPipe
/go/pkg/mod/github.com/microsoft/[email protected]/internal/gopkg.in/natefinch/npipe.v2/npipe_windows.go:384:13: undefined: cancelIoEx
/go/pkg/mod/github.com/microsoft/[email protected]/internal/gopkg.in/natefinch/npipe.v2/npipe_windows.go:539:9: undefined: createNamedPipe

This is due to the vendered npipe.v2 package missing support for ARM64.

This PR fixes the issue by adding the file znpipe_windows_arm64.go which is currently just a straight copy of znpipe_windows_amd64.go

[niallnsec]

@microsoft-github-policy-service agree company="Turaco Labs"

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.75%. Comparing base (dad23d2) to head (78f849a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #232      +/-   ##
==========================================
+ Coverage   74.71%   74.75%   +0.04%     
==========================================
  Files          32       32              
  Lines        6410     6410              
==========================================
+ Hits         4789     4792       +3     
+ Misses       1333     1331       -2     
+ Partials      288      287       -1     

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