ACI: Ensure we use native strings for signature (#55161)

* ACI: Ensure we use native strings for signature

* Add changelog fragment

changelogs/fragments/55150-native-strings-for-signature-auth.yaml

@@ -0,0 +1,2 @@
+bugfixes:
+- aci modules - Ensure we use native strings for signature

lib/ansible/module_utils/network/aci/aci.py

@@ -38,7 +38,7 @@ from copy import deepcopy
 
 from ansible.module_utils.parsing.convert_bool import boolean
 from ansible.module_utils.urls import fetch_url
-from ansible.module_utils._text import to_bytes
+from ansible.module_utils._text import to_bytes, to_native
 
 # Optional, only used for APIC signature-based authentication
 try:
@@ -241,7 +241,7 @@ class ACIModule(object):
         self.headers['Cookie'] = 'APIC-Certificate-Algorithm=v1.0; ' +\
                                  'APIC-Certificate-DN=%s; ' % sig_dn +\
                                  'APIC-Certificate-Fingerprint=fingerprint; ' +\
-                                 'APIC-Request-Signature=%s' % sig_signature
+                                 'APIC-Request-Signature=%s' % to_native(sig_signature)
 
     def response_json(self, rawoutput):
         ''' Handle APIC JSON response output '''