build: make requirements more flexible

According to #102 the requirements specified are minimum version. Currently they are defined as fixed versions in requirements.txt and setup.py leading to projects consuming this package are limited to using exactly these requirements instead of a more flexible range. This PR addresses this.

requirements.txt

@@ -1,11 +1,11 @@
-aiosqlite==0.20.0
-html2text==2024.2.26
-lxml==5.3.0
-litellm==1.48.0
-numpy>=1.26.0,<2.1.1
-pillow==10.4.0
-playwright==1.47.0
-python-dotenv==1.0.1
-requests>=2.26.0,<2.32.3
-beautifulsoup4==4.12.3
-playwright_stealth==1.0.6
+aiosqlite~=0.20
+html2text~=2024.2
+lxml~=5.3
+litellm~=1.48
+numpy>=1.26.0,<3
+pillow~=10.4
+playwright~=1.47
+python-dotenv~=1.0
+requests~=2.26
+beautifulsoup4~=4.12
+playwright_stealth~=1.0