Bump pyyaml from 5.1.1 to 5.1.2 in /requirements

Bumps [pyyaml](https://github.com/yaml/pyyaml) from 5.1.1 to 5.1.2.
- [Release notes](https://github.com/yaml/pyyaml/releases)
- [Changelog](https://github.com/yaml/pyyaml/blob/master/CHANGES)
- [Commits](https://github.com/yaml/pyyaml/commits)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

requirements/common.txt

@@ -170,18 +170,20 @@ sqlparse==0.3.0 \
     --hash=sha256:7c3dca29c022744e95b547e867cee89f4fce4373f3549ccd8797d8eb52cdb873
 
 # Used directly and also by Django's YAML serializer.
-PyYAML==5.1.1 \
-    --hash=sha256:70d9818f1c9cd5c48bb87804f2efc8692f1023dac7f1a1a5c61d454043c1d265 \
-    --hash=sha256:a0f329125a926876f647c9fa0ef32801587a12328b4a3c741270464e3e4fa778 \
-    --hash=sha256:cd0618c5ba5bda5f4039b9398bb7fb6a317bb8298218c3de25c47c4740e4b95e \
-    --hash=sha256:57acc1d8533cbe51f6662a55434f0dbecfa2b9eaf115bede8f6fd00115a0c0d3 \
-    --hash=sha256:ceacb9e5f8474dcf45b940578591c7f3d960e82f926c707788a570b51ba59190 \
-    --hash=sha256:fe6a88094b64132c4bb3b631412e90032e8cfe9745a58370462240b8cb7553cd \
-    --hash=sha256:68c8dd247f29f9a0d09375c9c6b8fdc64b60810ebf07ba4cdd64ceee3a58c7b7 \
-    --hash=sha256:588c94b3d16b76cfed8e0be54932e5729cc185caffaa5a451e7ad2f7ed8b4043 \
-    --hash=sha256:a3c252ab0fa1bb0d5a3f6449a4826732f3eb6c0270925548cac342bc9b22c225 \
-    --hash=sha256:86a93cccd50f8c125286e637328ff4eef108400dd7089b46a7be3445eecfa391 \
-    --hash=sha256:b4bb4d3f5e232425e25dda21c070ce05168a786ac9eda43768ab7f3ac2770955
+PyYAML==5.1.2 \
+    --hash=sha256:5124373960b0b3f4aa7df1707e63e9f109b5263eca5976c66e08b1c552d4eaf8 \
+    --hash=sha256:f81025eddd0327c7d4cfe9b62cf33190e1e736cc6e97502b3ec425f574b3e7a8 \
+    --hash=sha256:0113bc0ec2ad727182326b61326afa3d1d8280ae1122493553fd6f4397f33df9 \
+    --hash=sha256:5ca4f10adbddae56d824b2c09668e91219bb178a1eee1faa56af6f99f11bf696 \
+    --hash=sha256:bf47c0607522fdbca6c9e817a6e81b08491de50f3766a7a0e6a5be7905961b41 \
+    --hash=sha256:87ae4c829bb25b9fe99cf71fbb2140c448f534e24c998cc60f39ae4f94396a73 \
+    --hash=sha256:9de9919becc9cc2ff03637872a440195ac4241c80536632fffeb6a1e25a74299 \
+    --hash=sha256:a5a85b10e450c66b49f98846937e8cfca1db3127a9d5d1e31ca45c3d0bef4c5b \
+    --hash=sha256:b0997827b4f6a7c286c01c5f60384d218dca4ed7d9efa945c3e1aa623d5709ae \
+    --hash=sha256:7907be34ffa3c5a32b60b95f4d95ea25361c951383a894fec31be7252b2b6f34 \
+    --hash=sha256:7ec9b2a4ed5cad025c2278a1e6a19c011c80a3caaac804fd2d329e9cc2c287c9 \
+    --hash=sha256:b631ef96d3222e62861443cc89d6563ba3eeb816eeb96b2629345ab795e53681 \
+    --hash=sha256:01adf0b6c6f61bd11af6e10ca52b7d4057dd0be0343eb9283c878cf3af56aee4
 
 django-environ==0.4.5 \
     --hash=sha256:c57b3c11ec1f319d9474e3e5a79134f40174b17c7cc024bbb2fad84646b120c4 \