Bump mercurial from 5.3 to 5.5.1

Bumps [mercurial](https://mercurial-scm.org/) from 5.3 to 5.5.1.

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

requirements/prod.txt

@@ -94,10 +94,14 @@ ipython-genutils==0.2.0 \
 kombu==4.6.7 \
     --hash=sha256:2a9e7adff14d046c9996752b2c48b6d9185d0b992106d5160e1a179907a5d4ac \
     --hash=sha256:67b32ccb6fea030f8799f8fd50dd08e03a4b99464ebc4952d71d8747b1a52ad1
-mercurial==5.3 \
-    --hash=sha256:ae2e5490693bbc38d1102072ec0fdc6a831b998a2b428b85c6a12d0d8a8eb219 \
-    --hash=sha256:e57ff61d6b67695149dd451922b40aa455ab02e01711806a131a1e95c544f9b9 \
-    --hash=sha256:f39fa6d3268d3b6ea2ccb06925d7bdea6dab31ca29785f4874e44f83511b4737
+mercurial==5.5.1 \
+    --hash=sha256:38173ad4b6e92adf855571fa80ad39354179746272425c0f80c41a05213ef2b4 \
+    --hash=sha256:bdfbcb2685e10d156ac40f4dd5dc3875b781a3e0f2a7f51af7a166bbc084f288 \
+    --hash=sha256:1e65e522dfb79886214da3e2cad97a30e0ba33e981c7257ff12b312709e57a7e \
+    --hash=sha256:0f861955143710e0ad711e6fd9b207b415a381efd23516080277400a4d7c0a9a \
+    --hash=sha256:28c7ff77c48520903bc6b3ca5a3da045d90ff494fd777177773ebef3d2fef6f1 \
+    --hash=sha256:3dd711c915762c579ce1a7d1ea09e2dca82ed8bcce9d0e78b8f8993123257037 \
+    --hash=sha256:4f95ad8d575941835d67210e9f8700cc594a441e4fd0bd029c084923b4f40874
 mock==4.0.2 \
     --hash=sha256:3f9b2c0196c60d21838f307f5825a7b86b678cedc58ab9e50a8988187b4d81e0 \
     --hash=sha256:dd33eb70232b6118298d516bbcecd26704689c386594f0f3c4f13867b2c56f72 # pyup < 4.0.0