[PR #10459/ee783066 backport][stable-9] Fix ansible-core 2.19 deprecations (#10469)

Fix ansible-core 2.19 deprecations (#10459)

Do not return warnings.

(cherry picked from commit ee7830667a)

Co-authored-by: Felix Fontein <felix@fontein.de>

plugins/modules/sysupgrade.py

@@ -101,7 +101,6 @@ def sysupgrade_run(module):
     sysupgrade_bin = module.get_bin_path('/usr/sbin/sysupgrade', required=True)
     cmd = [sysupgrade_bin]
     changed = False
-    warnings = []
 
     # Setup command flags
     if module.params['snapshot']:
@@ -137,7 +136,6 @@ def sysupgrade_run(module):
         rc=rc,
         stderr=err,
         stdout=out,
-        warnings=warnings
     )