tighten up regex for path items (#2681)

https://spec.openapis.org/oas/v3.1.0#pathTemplating
"The value for these path parameters MUST NOT contain any unescaped “generic syntax” characters described by [[!RFC3986]]: forward slashes (/), question marks (?), or hashes (#)."

Author: karenetheridge

schemas/v3.1/schema.json

@@ -503,6 +503,9 @@
               },
               "then": {
                 "properties": {
+                  "name": {
+                    "pattern": "[^/#?]+$"
+                  },
                   "style": {
                     "default": "simple",
                     "enum": [

schemas/v3.1/schema.yaml

@@ -342,6 +342,8 @@ $defs:
                 - in
             then:
               properties:
+                name:
+                  pattern: '[^/#?]+$'
                 style:
                   default: simple
                   enum: