Fix requirements

Protobuf cannot be installed in the latest specified version, because
another dependency prevents it.

[noissue]

requirements.txt

@@ -27,7 +27,7 @@ opentelemetry-distro[otlp]>=0.45b0,<=0.46b0
 opentelemetry-exporter-otlp-proto-http>=1.24.0,<=1.25.0
 opentelemetry-instrumentation-django>=0.45b0,<=0.46b0
 opentelemetry-instrumentation-wsgi>=0.45b,<=0.46b0
-protobuf>=4.21.1,<5.27.3
+protobuf>=4.21.1,<5.0
 pulp-glue>=0.18.0,<0.26
 pygtrie>=2.5,<=2.5.0
 psycopg[binary]>=3.1.8,<=3.1.19