Update dependency python-dotenv to v0.21.1

Pipfile

@@ -9,7 +9,7 @@ name = "pypi"
 
 [packages]
 flask = "==2.0.3"
-python-dotenv = "==0.17.1"
+python-dotenv = "==0.21.1"
 flask-migrate = "==3.0.1"
 flask-sqlalchemy  = "==2.5.1"
 sqlalchemy = "==1.4.53"

Pipfile.lock

@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "3e2ddadb687d67eee6974c15de24ee02b77941eae9901b4939249f7e2881110e"
+            "sha256": "37326e79c0428ff1a05a5360a443b42f74bd7668ad8d394e65b1ad3d6c8da0da"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -266,11 +266,12 @@
         },
         "python-dotenv": {
             "hashes": [
-                "sha256:00aa34e92d992e9f8383730816359647f358f4a3be1ba45e5a5cefd27ee91544",
-                "sha256:b1ae5e9643d5ed987fc57cc2583021e38db531946518130777734f9589b3141f"
+                "sha256:1c93de8f636cde3ce377292818d0e440b6e45a82f215c3744979151fa8151c49",
+                "sha256:41e12e0318bebc859fcc4d97d4db8d20ad21721a6aa5047dd59f090391cb549a"
             ],
             "index": "pypi",
-            "version": "==0.17.1"
+            "markers": "python_version >= '3.7'",
+            "version": "==0.21.1"
         },
         "pyyaml": {
             "hashes": [
@@ -419,11 +420,11 @@
         },
         "zipp": {
             "hashes": [
-                "sha256:0145e43d89664cfe1a2e533adc75adafed82fe2da404b4bbb6b026c0157bdb31",
-                "sha256:58da6168be89f0be59beb194da1250516fdaa062ccebd30127ac65d30045e10d"
+                "sha256:9960cd8967c8f85a56f920d5d507274e74f9ff813a0ab8889a5b5be2daf44064",
+                "sha256:c22b14cc4763c5a5b04134207736c107db42e9d3ef2d9779d465f5f1bcba572b"
             ],
             "markers": "python_version >= '3.8'",
-            "version": "==3.20.0"
+            "version": "==3.20.1"
         }
     },
     "develop": {
@@ -595,11 +596,11 @@
         },
         "idna": {
             "hashes": [
-                "sha256:028ff3aadf0609c1fd278d8ea3089299412a7a8b9bd005dd08b9f8285bcb5cfc",
-                "sha256:82fee1fc78add43492d3a1898bfa6d8a904cc97d8427f683ed8e798d07761aa0"
+                "sha256:050b4e5baadcd44d760cedbd2b8e639f2ff89bbc7a5730fcc662954303377aac",
+                "sha256:d838c2c0ed6fced7693d5e8ab8e734d5f8fda53a039c0164afb0b82e771e3603"
             ],
-            "markers": "python_version >= '3.5'",
-            "version": "==3.7"
+            "markers": "python_version >= '3.6'",
+            "version": "==3.8"
         },
         "jinja2": {
             "hashes": [