examples/apps: unpin streamlit so protobuf>=6 can resolve (#1530)

`streamlit<1.46` pins `protobuf<6`, downgrading the app image to
protobuf 5.29.6 — older than flyteidl2's compiled gencode (6.33.5). The
app then crashes at startup with a protobuf Gencode/Runtime
`VersionError` before Streamlit runs. streamlit 1.46 relaxed the cap to
`protobuf<7`, so requiring `streamlit>=1.46` lets protobuf resolve to
6.x and the app boots.

Verified end-to-end on a self-hosted canary: the app image built from
`ghcr.io/flyteorg/flyte:py3.12-v2.6.13` + `streamlit>=1.46` starts
cleanly (Knative revision Ready); the old `streamlit==1.41.1` image
crash-loops with the VersionError.

Signed-off-by: Michael Hotan <mike@union.ai>
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Co-authored-by: Niels Bantilan <niels.bantilan@gmail.com>

Author: 3 people

examples/apps/basic_app.py

@@ -3,7 +3,9 @@
 import flyte
 import flyte.app
 
-image = flyte.Image.from_debian_base(python_version=(3, 12)).with_pip_packages("streamlit==1.41.1")
+# streamlit must allow protobuf>=6 (>=1.46 relaxed the cap to <7); older pins force
+# protobuf<6, which is incompatible with flyteidl2's gencode and crashes the app.
+image = flyte.Image.from_debian_base(python_version=(3, 12)).with_pip_packages("streamlit>=1.46")
 
 # The `App` declaration.
 # Uses the `ImageSpec` declared above.