[v14] Pin Teleport Terraform Provider to Teleport major version (#32898)

* Pin Teleport Terraform Provider to Teleport major version

The previous constrain `>= (=teleport.version=)` allows Terraform to pick any version bigger than the specified version. This is a problem because `>= 12.0.0` can actually select `14.0.0` which breaks our client guarantees when connecting to Auth server.

This PR forces Terraform to pick any version `>=12.0.0` and `< 13.0.0`. The pessimist version constrain prevents Terraform provider to use versions outside of the specified major version.

Signed-off-by: Tiago Silva <tiago.silva@goteleport.com>

* add terraform reference

* fix docs

---------

Signed-off-by: Tiago Silva <tiago.silva@goteleport.com>

docs/cspell.json

@@ -854,7 +854,8 @@
     "yubishm",
     "znmqk",
     "zxvf",
-    "zztop"
+    "zztop",
+    "supervillain"
   ],
   "flagWords": [
     "hte"