Update dependency responses to v0.12.0 (GoogleCloudPlatform#4604)

Author: renovate-bot

appengine/flexible/analytics/requirements-test.txt

@@ -1,2 +1,2 @@
 pytest==6.0.1
-responses==0.11.0
+responses==0.12.0

appengine/flexible/mailgun/requirements-test.txt

@@ -1,2 +1,2 @@
 pytest==6.0.1
-responses==0.11.0
+responses==0.12.0

appengine/flexible/mailjet/requirements-test.txt

@@ -1,2 +1,2 @@
 pytest==6.0.1
-responses==0.11.0
+responses==0.12.0

appengine/flexible/twilio/requirements-test.txt

@@ -1,2 +1,2 @@
 pytest==6.0.1
-responses==0.11.0
+responses==0.12.0

appengine/standard/analytics/requirements-test.txt

@@ -1,2 +1,2 @@
 pytest==4.6.11; python_version < '3.0'
-responses==0.11.0
+responses==0.12.0

appengine/standard/mailjet/requirements-test.txt

@@ -1,2 +1,2 @@
 pytest==4.6.11; python_version < '3.0'
-responses==0.11.0
+responses==0.12.0

functions/concepts/requirements-test.txt

@@ -2,4 +2,4 @@ flask==1.1.2
 mock==4.0.2
 pytest==6.0.1
 requests==2.24.0
-responses==0.11.0
+responses==0.12.0

functions/tips/requirements-test.txt

@@ -1,4 +1,4 @@
 flask==1.1.2
 pytest==6.0.1
 requests==2.24.0
-responses==0.11.0
+responses==0.12.0