deps: précise les versions minimales des dépendances requises

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requirements.txt

-beautifulsoup4
-selenium
-pyvirtualdisplay
-pdfminer.six
-requests
-stem
-Mastodon.py
-dateparser
+beautifulsoup4>=4.12.3
+dateparser>=1.2.0
+Mastodon.py>=1.8.1
+pdfminer.six>=20231228
+PyVirtualDisplay>=3.0
+requests>=2.31.0
+selenium>=4.18.1
+stem>=1.8.2