Fixed CFBundleVersion version in Python 3.

Bug: None
Change-Id: I69343e26aee74189b192b1de40bfaa5fcac093f3
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/238426
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Yura Yaroshevich <yura.yaroshevich@gmail.com>
Cr-Commit-Position: refs/heads/main@{#35390}
diff --git a/tools_webrtc/ios/build_ios_libs.py b/tools_webrtc/ios/build_ios_libs.py
index 19ba499..f0b2826 100755
--- a/tools_webrtc/ios/build_ios_libs.py
+++ b/tools_webrtc/ios/build_ios_libs.py
@@ -309,7 +309,7 @@
                 'PlistBuddy', '-c', 'Print :CFBundleShortVersionString',
                 infoplist_path
             ]
-            major_minor = subprocess.check_output(cmd).strip()
+            major_minor = subprocess.check_output(cmd).decode('utf-8').strip()
             version_number = '%s.%s' % (major_minor, args.revision)
             logging.info('Substituting revision number: %s', version_number)
             cmd = [