deps: update dependency google-cloud-core to v2.3.2 (#1595)

diff --git a/.kokoro/requirements.txt b/.kokoro/requirements.txt
index 5cb0dc3..0844809 100644
--- a/.kokoro/requirements.txt
+++ b/.kokoro/requirements.txt
@@ -146,9 +146,9 @@
     #   google-api-core
     #   google-cloud-core
     #   google-cloud-storage
-google-cloud-core==2.3.1 \
-    --hash=sha256:113ba4f492467d5bd442c8d724c1a25ad7384045c3178369038840ecdd19346c \
-    --hash=sha256:34334359cb04187bdc80ddcf613e462dfd7a3aabbc3fe4d118517ab4b9303d53
+google-cloud-core==2.3.2 \
+    --hash=sha256:8417acf6466be2fa85123441696c4badda48db314c607cf1e5d543fa8bdc22fe \
+    --hash=sha256:b9529ee7047fd8d4bf4a2182de619154240df17fbe60ead399078c1ae152af9a
     # via google-cloud-storage
 google-cloud-storage==2.0.0 \
     --hash=sha256:a57a15aead0f9dfbd4381f1bfdbe8bf89818a4bd75bab846cafcefb2db846c47 \