4.6 release config (#48136)

Release config for 4.6, auto generated by release tool

## Test plan

N/A

<!-- All pull requests REQUIRE a test plan:
https://docs.sourcegraph.com/dev/background-information/testing_principles
-->

---------

Co-authored-by: Bolaji Olajide <[email protected]>

dev/release/release-config.jsonc

@@ -4,11 +4,11 @@
     "slackAnnounceChannel": "announce-engineering"
   },
   "scheduledReleases": {
-    "4.5.0": {
-      "codeFreezeDate": "2023-02-15T10:00:00.000-08:00",
-      "securityApprovalDate": "2023-02-15T10:00:00.000-08:00",
-      "releaseDate": "2023-02-22T10:00:00.000-08:00",
-      "current": "4.5.0",
+    "4.6.0": {
+      "codeFreezeDate": "2023-03-13T10:00:00.000-07:00",
+      "securityApprovalDate": "2023-03-15T10:00:00.000-07:00",
+      "releaseDate": "2023-03-22T10:00:00.000-07:00",
+      "current": "4.6.0",
       "captainGitHubUsername": "coury-clark",
       "captainSlackUsername": "coury"
     }
@@ -20,4 +20,4 @@
     "calendar": false,
     "slack": false
   }
-}
+}