chore(deps): update dependency rasterio to v1.2.8 (GoogleCloudPlatform#6669)

Co-authored-by: gcf-merge-on-green[bot] <60162190+gcf-merge-on-green[bot]@users.noreply.github.com>
Co-authored-by: Leah E. Cole <[email protected]>

Author: 3 people

dataflow/gpu-examples/tensorflow-landsat/requirements.txt

@@ -1,4 +1,4 @@
 Pillow==8.3.2
 apache-beam[gcp]==2.31.0
-rasterio==1.2.4
+rasterio==1.2.8
 tensorflow==2.6.0