Update dependency Pillow to v7

This MR contains the following updates:

Package	Type	Update	Change
Pillow (source)	dependencies	major	^6.1 -> ^7.0

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pyproject.toml

@@ -28,7 +28,7 @@ django-easy-audit = {version ="^1.2rc1", allow-prereleases = true}
 django-middleware-global-request = "^0.1.2"
 django-menu-generator = "^1.0.4"
 django-tables2 = "^2.1"
-Pillow = "^6.1"
+Pillow = "^7.0"
 django-phonenumber-field = {version = ">=3.0, <5.0", extras = ["phonenumbers"]}
 django-sass-processor = "^0.8"
 libsass = "^0.19.2"