Update release notes for 3.10.0

Author: ksunden

SECURITY.md

@@ -8,14 +8,13 @@ versions.
 
 | Version | Supported          |
 | ------- | ------------------ |
+| 3.10.x  | :white_check_mark: |
 | 3.9.x   | :white_check_mark: |
-| 3.8.x   | :white_check_mark: |
+| 3.8.x   | :x:                |
 | 3.7.x   | :x:                |
 | 3.6.x   | :x:                |
 | 3.5.x   | :x:                |
-| 3.4.x   | :x:                |
-| 3.3.x   | :x:                |
-| < 3.3   | :x:                |
+| < 3.5   | :x:                |
 
 
 ## Reporting a Vulnerability

doc/_static/switcher.json

@@ -1,15 +1,20 @@
 [
     {
-        "name": "3.9 (stable)",
-        "version": "3.9.2",
+        "name": "3.10 (stable)",
+        "version": "3.10.0",
         "url": "https://matplotlib.org/stable/",
         "preferred": true
     },
     {
-        "name": "3.10 (dev)",
+        "name": "3.11 (dev)",
         "version": "dev",
         "url": "https://matplotlib.org/devdocs/"
     },
+    {
+        "name": "3.9",
+        "version": "3.9.3",
+        "url": "https://matplotlib.org/3.9.4/"
+    },
     {
         "name": "3.8",
         "version": "3.8.4",