P.S.A.: Dropping support for ARM32

[florelis]

Description of the new feature / enhancement

We will stop creating new builds for ARM32 as it is no longer supported on Windows. ARM64 will still be supported.

Proposed technical implementation details

No response

[vedantmgoyal9]

Will arm architecture be discontinued too?

winget-cli/schemas/JSON/manifests/v1.10.0/manifest.installer.1.10.0.json

Lines 112 to 122 in b49f784

	"Architecture": {
	"type": "string",
	"enum": [
	"x86",
	"x64",
	"arm",
	"arm64",
	"neutral"
	],
	"description": "The installer target architecture"
	},

[florelis]

@vedantmgoyal9
ARM32=ARM. I just wanted to make it clear that it is not ARM64.

This change is only about how we build winget itself. There won't be any changes to manifests or supported packages.