[php] Switches to a custom PHP automation

This uses the PHP releases API. Limitations:

1. New Major versions will needed to be added manually

The src for the API is at https://github.com/php/web-php/blob/master/releases/index.php
The data comes from https://github.com/php/web-php/blob/master/include/releases.inc

This commit keeps the old sort method for a cleaner diff. Next commits
in this PR will fix the sorting to be standardized.

The difference from using tags is:

1. One additional version shows up (4.0.4) which we'd missed previously
   due to being tagged as php-4.0.4REL.
2. Slightly more accurate dates.

src/php.py

@@ -0,0 +1,46 @@
+import urllib.request
+import datetime
+import json
+
+PHP_MAJOR_VERSIONS = [4, 5, 7, 8]
+
+
+# Date format is 03 Nov 2022
+# With some versions using 03 November 2022 instead
+# we return it as YYYY-MM-DD
+def parse_date(date_str):
+    try:
+        return datetime.datetime.strptime(date_str, "%d %b %Y").strftime("%Y-%m-%d")
+    except ValueError:
+        return datetime.datetime.strptime(date_str, "%d %B %Y").strftime("%Y-%m-%d")
+
+
+def fetch_versions(major_version):
+    url = f"https://www.php.net/releases/index.php?json&max=-1&version={major_version}"
+    with urllib.request.urlopen(url, data=None, timeout=5) as response:
+        data = json.loads(response.read())
+        for v in data:
+            data[v] = parse_date(data[v]["date"])
+            print(f"{v}: {data[v]}")
+
+        return data
+
+
+with open("releases/php.json", "w") as f:
+    print("::group::php")
+    releases = {}
+
+    for major_version in PHP_MAJOR_VERSIONS:
+        releases |= fetch_versions(major_version)
+
+    f.write(
+        json.dumps(
+            dict(sorted(
+                releases.items(),
+                key=lambda x: list(map(str, x[0].split(".")))
+            )),
+            indent=2,
+        )
+    )
+
+    print("::endgroup::")