Update dependency isort to v5

This MR contains the following updates:

Package	Type	Update	Change
isort	dev-dependencies	major	^4.3.21 -> ^5.0.0

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poetry.lock

@@ -416,14 +416,13 @@ category = "dev"
 description = "A Python utility / library to sort Python imports."
 name = "isort"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "4.3.21"
+python-versions = ">=3.6,<4.0"
+version = "5.4.2"
 
 [package.extras]
-pipfile = ["pipreqs", "requirementslib"]
-pyproject = ["toml"]
-requirements = ["pipreqs", "pip-api"]
-xdg_home = ["appdirs (>=1.4.0)"]
+colors = ["colorama (>=0.4.3,<0.5.0)"]
+pipfile_deprecated_finder = ["pipreqs", "requirementslib", "tomlkit (>=0.5.3)"]
+requirements_deprecated_finder = ["pipreqs", "pip-api"]
 
 [[package]]
 category = "dev"
@@ -1098,7 +1097,7 @@ django = ["dicttoxml", "django"]
 sysstat = ["sadf"]
 
 [metadata]
-content-hash = "fa0dd623dd3872e83378ab17a077777a4919bba26c75d875cb22a01a5d286aee"
+content-hash = "3fe68bc1146f29630928f9c64b60e97eeae3626bf2f3ce1fde0332f4426cdee7"
 python-versions = "^3.6"
 
 [metadata.files]
@@ -1272,8 +1271,8 @@ iniconfig = [
     {file = "iniconfig-1.0.1.tar.gz", hash = "sha256:e5f92f89355a67de0595932a6c6c02ab4afddc6fcdc0bfc5becd0d60884d3f69"},
 ]
 isort = [
-    {file = "isort-4.3.21-py2.py3-none-any.whl", hash = "sha256:6e811fcb295968434526407adb8796944f1988c5b65e8139058f2014cbe100fd"},
-    {file = "isort-4.3.21.tar.gz", hash = "sha256:54da7e92468955c4fceacd0c86bd0ec997b0e1ee80d97f67c35a78b719dccab1"},
+    {file = "isort-5.4.2-py3-none-any.whl", hash = "sha256:60a1b97e33f61243d12647aaaa3e6cc6778f5eb9f42997650f1cc975b6008750"},
+    {file = "isort-5.4.2.tar.gz", hash = "sha256:d488ba1c5a2db721669cc180180d5acf84ebdc5af7827f7aaeaa75f73cf0e2b8"},
 ]
 jinja2 = [
     {file = "Jinja2-2.11.2-py2.py3-none-any.whl", hash = "sha256:f0a4641d3cf955324a89c04f3d94663aa4d638abe8f733ecd3582848e1c37035"},