Align requirements.txt with setup.cfg (use >=)

Signed-off-by: Marc-Etienne Vargenau <marc-etienne.vargenau@nokia.com>

Author: vargenau

tools/openchain_telco_sbom_validator/requirements.txt

@@ -1,6 +1,6 @@
-spdx-tools==0.8.3
-requests==2.32.4
-prettytable==3.16.0
-packageurl-python==0.17.1
-ntia-conformance-checker==3.2.0
-validators==0.35.0
+spdx-tools>=0.8.3
+requests>=2.32.4
+prettytable>=3.16.0
+packageurl-python>=0.17.1
+ntia-conformance-checker>=3.2.0
+validators>=0.35.0