Update python-dotenv requirement from ~=0.20.0 to ~=0.21.0

Updates the requirements on [python-dotenv](https://github.com/theskumar/python-dotenv) to permit the latest version.
- [Release notes](https://github.com/theskumar/python-dotenv/releases)
- [Changelog](https://github.com/theskumar/python-dotenv/blob/main/CHANGELOG.md)
- [Commits](https://github.com/theskumar/python-dotenv/compare/v0.20.0...v0.21.0)

---
updated-dependencies:
- dependency-name: python-dotenv
  dependency-type: direct:production
...

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

.github/dependabot.yml

@@ -10,9 +10,4 @@ updates:
     directory: "/"
     schedule:
       interval: "daily"
-    assignees:
+    open-pull-requests-limit: 100
-      - "NormalParameter"
-      - "Rripped"
-      - "FlorianKellermann"
-      - "H4CK3R-01"
-    open-pull-requests-limit: 100

requirements.txt

@@ -1,5 +1,5 @@
 pyTelegramBotAPI~=4.5.1
-python-dotenv~=0.20.0
+python-dotenv~=0.21.0
 APScheduler~=3.9.1
 SQLAlchemy~=1.4.37
 pymysql==1.0.2
@@ -8,5 +8,5 @@ beautifulsoup4~=4.11.1
 pandas~=1.4.2
 PyVirtualDisplay~=3.0
 selenium~=4.2.0
-plotly~=5.10.0
+plotly~=5.8.0
 fuzzywuzzy~=0.18.0