fix: use fixed version to fix mkdocs build error

ref: https://github.com/mkdocs/mkdocs/issues/2799

poetry.lock

@@ -473,13 +473,13 @@ reference = "tuna"
 
 [[package]]
 name = "jinja2"
-version = "3.1.2"
+version = "3.0.3"
 description = "A very fast and expressive template engine."
 optional = false
-python-versions = ">=3.7"
+python-versions = ">=3.6"
 files = [
-    {file = "Jinja2-3.1.2-py3-none-any.whl", hash = "sha256:6088930bfe239f0e6710546ab9c19c9ef35e29792895fed6e6e31a023a182a61"},
-    {file = "Jinja2-3.1.2.tar.gz", hash = "sha256:31351a702a408a9e7595a8fc6150fc3f43bb6bf7e319770cbc0db9df9437e852"},
+    {file = "Jinja2-3.0.3-py3-none-any.whl", hash = "sha256:077ce6014f7b40d03b47d1f1ca4b0fc8328a692bd284016f806ed0eaca390ad8"},
+    {file = "Jinja2-3.0.3.tar.gz", hash = "sha256:611bb273cd68f3b993fabdc4064fc858c5b47a973cb5aa7999ec1ba405c87cd7"},
 ]
 
 [package.dependencies]
@@ -1429,4 +1429,4 @@ reference = "tuna"
 [metadata]
 lock-version = "2.0"
 python-versions = ">=3.7"
-content-hash = "63d32acdb228c894a02362493657eda5db7c9985904835d2af33e77988197640"
+content-hash = "c8c4bbafac685a0fe78c1a33d9353cb2e98966dc100356e74ff6562e3d21a7b7"

pyproject.toml

@@ -28,8 +28,12 @@ qrcode = "*"
 django-extensions = "*"
 mkdocs = "*"
 mkdocs-material = "*"
+jinja2 = "==3.0.3"
 black = "==19.10b0"
 
+[tool.poetry.group.dev.dependencies]
+jinja2 = "3.0.3"
+
 [build-system]
 requires = ["poetry-core>=1.0.0"]
 build-backend = "poetry.core.masonry.api"