deps: update dependency google-cloud-storage to v2.12.0 (#2155)

Author: renovate-bot

.kokoro/requirements.txt

@@ -141,9 +141,9 @@ google-cloud-core==2.3.3 \
     --hash=sha256:37b80273c8d7eee1ae816b3a20ae43585ea50506cb0e60f3cf5be5f87f1373cb \
     --hash=sha256:fbd11cad3e98a7e5b0343dc07cb1039a5ffd7a5bb96e1f1e27cee4bda4a90863
     # via google-cloud-storage
-google-cloud-storage==2.0.0 \
-    --hash=sha256:a57a15aead0f9dfbd4381f1bfdbe8bf89818a4bd75bab846cafcefb2db846c47 \
-    --hash=sha256:ec4be60bb223a3a960f0d01697d849b86d91cad815a84915a32ed3635e93a5e7
+google-cloud-storage==2.12.0 \
+    --hash=sha256:57c0bcda2f5e11f008a155d8636d8381d5abab46b58e0cae0e46dd5e595e6b46 \
+    --hash=sha256:bc52563439d42981b6e21b071a76da2791672776eda3ba99d13a8061ebbd6e5e
     # via gcp-docuploader
 google-crc32c==1.5.0 \
     --hash=sha256:024894d9d3cfbc5943f8f230e23950cd4906b2fe004c72e29b209420a1e6b05a \