Update versions-manifest.json (#11)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

versions-manifest.json

@@ -1,4 +1,25 @@
 [
+  {
+    "version": "3.15.0-beta.1",
+    "stable": false,
+    "release_url": "https://github.com/riseproject-dev/python-versions/releases/tag/3.15.0-beta.1-25543651773",
+    "files": [
+      {
+        "filename": "python-3.15.0-beta.1-linux-24.04-riscv64-freethreaded.tar.gz",
+        "arch": "riscv64-freethreaded",
+        "platform": "linux",
+        "platform_version": "24.04",
+        "download_url": "https://github.com/riseproject-dev/python-versions/releases/download/3.15.0-beta.1-25543651773/python-3.15.0-beta.1-linux-24.04-riscv64-freethreaded.tar.gz"
+      },
+      {
+        "filename": "python-3.15.0-beta.1-linux-24.04-riscv64.tar.gz",
+        "arch": "riscv64",
+        "platform": "linux",
+        "platform_version": "24.04",
+        "download_url": "https://github.com/riseproject-dev/python-versions/releases/download/3.15.0-beta.1-25543651773/python-3.15.0-beta.1-linux-24.04-riscv64.tar.gz"
+      }
+    ]
+  },
   {
     "version": "3.15.0-alpha.8",
     "stable": false,