fix: drop lib4sbom pinning in requirements.txt (#5273)

lib4sbom was pinned to version 0.8.2 in commit
f74497c (probably because lib4sbom
0.8.3 had a critical issue).

Then lib4sbom was bumped to version 0.8.4 in commit
929f126 and to version 0.8.7 in commit
da64903.

Replace = by >= as there is no need to enforce version 0.8.7 of lib4sbom

Fix #5179

Signed-off-by: Fabrice Fontaine <[email protected]>

Author: ffontaine

requirements.txt

@@ -9,7 +9,7 @@ importlib_metadata>=3.6; python_version < "3.10"
 importlib_resources; python_version < "3.9"
 jinja2>=2.11.3
 jsonschema>=3.0.2
-lib4sbom==0.8.7 # Pinned due to bug.  Was lib4sbom>=0.7.2
+lib4sbom>=0.8.7
 lib4vex>=0.2.0
 packageurl-python
 packaging>=22.0