Add 3.10.20, 3.11.15, and 3.12.13 release dates

<https://discuss.python.org/t/106363>

Author: jwodder

pyversion-info-data.json

@@ -230,6 +230,7 @@
         "3.10.17": "2025-04-08",
         "3.10.18": "2025-06-03",
         "3.10.19": "2025-10-09",
+        "3.10.20": "2026-03-03",
         "3.11.0": "2022-10-24",
         "3.11.1": "2022-12-06",
         "3.11.2": "2023-02-08",
@@ -245,6 +246,7 @@
         "3.11.12": "2025-04-08",
         "3.11.13": "2025-06-03",
         "3.11.14": "2025-10-09",
+        "3.11.15": "2026-03-03",
         "3.12.0": "2023-10-02",
         "3.12.1": "2023-12-07",
         "3.12.2": "2024-02-06",
@@ -258,6 +260,7 @@
         "3.12.10": "2025-04-08",
         "3.12.11": "2025-06-03",
         "3.12.12": "2025-10-09",
+        "3.12.13": "2026-03-03",
         "3.13.0": "2024-10-07",
         "3.13.1": "2024-12-03",
         "3.13.2": "2025-02-04",

pyversion-info-data.v1.json

@@ -1,5 +1,5 @@
 {
-    "last_modified": "2026-02-23T23:04:43+00:00",
+    "last_modified": "2026-03-03T20:37:26+00:00",
     "cpython": {
         "release_dates": {
             "0.9.0": "1991-02-20",
@@ -232,6 +232,7 @@
             "3.10.17": "2025-04-08",
             "3.10.18": "2025-06-03",
             "3.10.19": "2025-10-09",
+            "3.10.20": "2026-03-03",
             "3.11.0": "2022-10-24",
             "3.11.1": "2022-12-06",
             "3.11.2": "2023-02-08",
@@ -247,6 +248,7 @@
             "3.11.12": "2025-04-08",
             "3.11.13": "2025-06-03",
             "3.11.14": "2025-10-09",
+            "3.11.15": "2026-03-03",
             "3.12.0": "2023-10-02",
             "3.12.1": "2023-12-07",
             "3.12.2": "2024-02-06",
@@ -260,6 +262,7 @@
             "3.12.10": "2025-04-08",
             "3.12.11": "2025-06-03",
             "3.12.12": "2025-10-09",
+            "3.12.13": "2026-03-03",
             "3.13.0": "2024-10-07",
             "3.13.1": "2024-12-03",
             "3.13.2": "2025-02-04",