Remove promscale from vendors.yaml

Per their documentation (https://promscale-legacy-docs.timescale.com/):

> Promscale has been discontinued. We strongly recommend that you do not use Promscale in a production environment. Learn more.

Also for reference: timescale/promscale#1836

data/ecosystem/vendors.yaml

@@ -1,4 +1,4 @@
-# cSpell:ignore Coralogix Cribl ITRS Kloud Logz Crowdstrike Humio Lumigo observ Promscale Teletrace Uptrace Greptime KloudMate
+# cSpell:ignore Coralogix Cribl ITRS Kloud Logz Crowdstrike Humio Lumigo observ Teletrace Uptrace Greptime KloudMate
 - name: AppDynamics (Cisco)
   distribution: true
   nativeOTLP: true
@@ -202,13 +202,6 @@
   contact: ''
   oss: false
   commercial: true
-- name: Promscale
-  distribution: false
-  nativeOTLP: true
-  url: 'https://www.timescale.com/promscale'
-  contact: ''
-  oss: false
-  commercial: true
 - name: Sentry
   distribution: true
   nativeOTLP: false