chore: remove one-off Discord-announce workflow

[EtienneLescot]

Cleans up the temporary workflow added in #137. It already did its job — the v1.7.0 stable announcement was posted to Discord successfully (see run https://github.com/getopenscreen/openscreen/actions/runs/29708097889).

[coderabbitai]

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• .github/workflows/temp-discord-announce.yml

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Run ID: 78e3fcb7-6db2-475d-a90f-f88a7ecd81f8

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• .github/workflows/temp-discord-announce.yml

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