cleanup unused files in .github (#189066)

i have removed
calender.yml. the The dates have not been updated since 2018
subscribers.json. there is nothing in the file.

Jvr committed 2y ago

eec8448f3558b872ed26e4d3b0d4dac9939b1951

Parent: 65ad9a3

Committed by GitHub <[email protected]> on 10/5/2023, 6:30:59 PM