[bot] Update from tektoncd/chains to 69a8f5f

    $ git diff --stat 69a8f5f..bb02106
     docs/config.md                    |  51 +++++--------
     pkg/chains/storage/docdb/docdb.go | 150 +++++++++-----------------------------
     pkg/config/config.go              |  21 +++---
     3 files changed, 64 insertions(+), 158 deletions(-)

https://github.com/tektoncd/chains/compare/69a8f5fa5d47faa1d64d682ec184a45ade8ed192..bb02106d33effee9b4bf59c07d3d8257b1a6f5bd

head

@@ -1 +1 @@
-bb02106d33effee9b4bf59c07d3d8257b1a6f5bd
+69a8f5fa5d47faa1d64d682ec184a45ade8ed192