Bump pyyaml from 3.12 to 5.1 in /spot-ingest

Bumps [pyyaml](https://github.com/yaml/pyyaml) from 3.12 to 5.1.
- [Release notes](https://github.com/yaml/pyyaml/releases)
- [Changelog](https://github.com/yaml/pyyaml/blob/master/CHANGES)
- [Commits](https://github.com/yaml/pyyaml/compare/3.12...5.1)

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/spot-ingest/streaming-requirements.txt b/spot-ingest/streaming-requirements.txt
index 9e0db85..29034d1 100644
--- a/spot-ingest/streaming-requirements.txt
+++ b/spot-ingest/streaming-requirements.txt
@@ -1,4 +1,4 @@
-PyYAML==3.12
+PyYAML==5.1
 argh==0.26.2
 argparse==1.2.1
 avro==1.8.2