Extract latest beam version directly from the request (#31487)

Co-authored-by: Yi Hu <yathu@google.com>

.github/trigger_files/beam_PostCommit_XVR_Flink.json

@@ -1,3 +1,4 @@
 {
-  "comment": "Modify this file in a trivial way to cause this test suite to run"
+  "comment": "Modify this file in a trivial way to cause this test suite to run",
+  "modification": 1
 }

sdks/java/extensions/python/src/main/resources/org/apache/beam/sdk/extensions/python/bootstrap_beam_venv.py

@@ -30,7 +30,6 @@
 import shutil
 import subprocess
 import sys
-from pkg_resources import parse_version
 
 
 def main():
@@ -63,14 +62,7 @@ def main():
     if options.beam_version == 'latest':
         info = json.load(
             urllib.request.urlopen("https://pypi.org/pypi/apache_beam/json"))
-
-        def maybe_strict_version(s):
-            try:
-                return parse_version(s)
-            except:
-                return parse_version('0.0')
-
-        beam_version = max(info['releases'], key=maybe_strict_version)
+        beam_version = info['info']['version']
         beam_package = 'apache_beam[gcp,aws,azure,dataframe]==' + beam_version
     elif (os.path.exists(options.beam_version)
           or options.beam_version.startswith('http://')