Update rdflib requirement from <7.0.0,>=4.2.2 to >=4.2.2,<8.0.0

Updates the requirements on [rdflib](https://github.com/RDFLib/rdflib) to permit the latest version.
- [Release notes](https://github.com/RDFLib/rdflib/releases)
- [Changelog](https://github.com/RDFLib/rdflib/blob/main/CHANGELOG.md)
- [Commits](RDFLib/rdflib@4.2.2...7.0.0)

---
updated-dependencies:
- dependency-name: rdflib
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements.txt

@@ -1,6 +1,6 @@
 requests >= 1.0
 ruamel.yaml >= 0.17.6, < 0.18
-rdflib>= 4.2.2, < 7.0.0
+rdflib>= 4.2.2, < 8.0.0
 mistune>=2.0.3,<2.1
 CacheControl[filecache]>= 0.11.7, < 0.14
 black<23.8

setup.py

@@ -82,7 +82,7 @@
 install_requires = [
     "requests >= 1.0",
     "ruamel.yaml >= 0.17.6, < 0.18",
-    "rdflib >= 4.2.2, < 7.0.0",
+    "rdflib >= 4.2.2, < 8.0.0",
     "mistune>=2.0.3,<2.1",
     "CacheControl[filecache] >= 0.11.7, < 0.14",
     "mypy_extensions",