chore(versions.txt): update Erlang/OTP version file

Author: github-actions[bot]

assets/erlang_otp_versions_from_gtihub_api.json

@@ -49,6 +49,16 @@
         },
         "node_id": "MDM6UmVmMzc0OTI3OnJlZnMvdGFncy9SMTZCMDJfeWllbGRpbmdfYmluYXJ5X3RvX3Rlcm0="
     },
+    {
+        "name": "OTP-28.0-rc4",
+        "zipball_url": "https://api.github.com/repos/erlang/otp/zipball/refs/tags/OTP-28.0-rc4",
+        "tarball_url": "https://api.github.com/repos/erlang/otp/tarball/refs/tags/OTP-28.0-rc4",
+        "commit": {
+            "sha": "56f63ad95cd71ee00b535e6db4e8be180baa6066",
+            "url": "https://api.github.com/repos/erlang/otp/commits/56f63ad95cd71ee00b535e6db4e8be180baa6066"
+        },
+        "node_id": "MDM6UmVmMzc0OTI3OnJlZnMvdGFncy9PVFAtMjguMC1yYzQ="
+    },
     {
         "name": "OTP-28.0-rc3",
         "zipball_url": "https://api.github.com/repos/erlang/otp/zipball/refs/tags/OTP-28.0-rc3",

assets/versions.txt

@@ -1,3 +1,4 @@
+28.0-rc4
 28.0-rc3
 28.0-rc2
 28.0-rc1