Bump google-cloud-bigquery from 1.6.0 to 1.7.0 (#5019)

Bumps [google-cloud-bigquery](https://github.com/GoogleCloudPlatform/google-cloud-python) from 1.6.0 to 1.7.0.
- [Release notes](https://github.com/GoogleCloudPlatform/google-cloud-python/releases)
- [Changelog](https://github.com/googleapis/google-cloud-python/blob/master/CHANGELOG.md)
- [Commits](googleapis/google-cloud-python@storage-1.6.0...storage-1.7.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

requirements/main.txt

@@ -196,9 +196,9 @@ google-api-core==1.5.1 \
 google-auth==1.5.1 \
     --hash=sha256:9ca363facbf2622d9ba828017536ccca2e0f58bd15e659b52f312172f8815530 \
     --hash=sha256:a4cf9e803f2176b5de442763bd339b313d3f1ed3002e3e1eb6eec1d7c9bbc9b4
-google-cloud-bigquery==1.6.0 \
-    --hash=sha256:a9c7bf529e207664b7a1e69968e99290bb098e53130884526c8d49e6b61f0af9 \
-    --hash=sha256:d559ba1e05cf6a960e09bb5aab3aeb4d50ad9e08c77a20a17c01c9b2bd8d6cb7
+google-cloud-bigquery==1.7.0 \
+    --hash=sha256:1c1b2a560c7f0d587eb73d44ee0f20b2224ffc59093385c3771f68abd4a8fc08 \
+    --hash=sha256:c1c629f79299109cac0b71e3fdd7e1ab6f881a1a8ea54985531c2843c7c3c9b9
 google-cloud-core==0.28.1 \
     --hash=sha256:0090df83dbc5cb2405fa90844366d13176d1c0b48181c1807ab15f53be403f73 \
     --hash=sha256:89e8140a288acec20c5e56159461d3afa4073570c9758c05d4e6cb7f2f8cc440