docs: remove 1.9.x row in Envoy compatibility matrix (#12828)

website/content/docs/connect/proxies/envoy.mdx

@@ -39,11 +39,9 @@ Consul supports **four major Envoy releases** at the beginning of each major Con
 | 1.12.x              | 1.22.0, 1.21.1, 1.20.2, 1.19.3                                                     |
 | 1.11.x              | 1.20.2, 1.19.3, 1.18.6, 1.17.4<sup>1</sup>                                         |
 | 1.10.x              | 1.18.6, 1.17.4<sup>1</sup>, 1.16.5<sup>1</sup> , 1.15.5<sup>1</sup>                |
-| 1.9.x               | 1.16.5<sup>1</sup>, 1.15.5<sup>1</sup>, 1.14.7<sup>1,2</sup>, 1.13.7<sup>1,2</sup> |
 
 1. Envoy 1.20.1 and earlier are vulnerable to [CVE-2022-21654](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-21654) and [CVE-2022-21655](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-21655). Both CVEs were patched in Envoy versions 1.18.6, 1.19.3, and 1.20.2.
 Envoy 1.16.x and older releases are no longer supported (see [HCSEC-2022-07](https://discuss.hashicorp.com/t/hcsec-2022-07-consul-s-connect-service-mesh-affected-by-recent-envoy-security-releases/36332)). Consul 1.9.x clusters should be upgraded to 1.10.x and Envoy upgraded to the latest supported Envoy version for that release, 1.18.6.
-1. Use Consul 1.9.0+ with Envoy 1.15.0+ to ensure that intention enforcement is updated as quickly as possible after any changes. [Additional information](https://github.com/envoyproxy/envoy/pull/10662).
 
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