tests: fix tests on main (#452)

* tests: avoid using default credentials in unit tests Closes #451. * tests: work around change in error raised by protobuf>=3.18.0 Closes #446. * tests: pin minimum 'protobuf' version under 3.6 Inherited from 'google-api-core`.
googleapis · Sep 22, 2021 · b88b4e7 · b88b4e7
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commit b88b4e7
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diff --git a/testing/constraints-3.6.txt b/testing/constraints-3.6.txt
@@ -8,4 +8,5 @@
 google-api-core==1.26.0
 google-cloud-core==1.4.1
 proto-plus==1.10.0
-google-auth==1.24.0  # TODO: remove when google-auth>=1.25.0 is required through google-api-core
+protobuf==3.12.0  # transitive from `google-api-core`
+google-auth==1.24.0  # TODO: remove when google-auth>=1.25.0 is required through google-api-core