Blocklist TF nightly without linux Python3.7 wheel

PiperOrigin-RevId: 377601026

Author: sharadmv

testing/install_test_dependencies.sh

@@ -95,7 +95,7 @@ find_good_tf_nightly_version_str() {
   # These are nightly builds we'd like to avoid for some reason; separated by
   # regex OR operator.
   BAD_NIGHTLY_DATES="20200112\|20200113\|20210119\|20210219\|20210220\|\
-  20210221\|20210222\|20210224\|20210316\|20210518\|20210519"
+  20210221\|20210222\|20210224\|20210316\|20210518\|20210519\|20210604"
   # This will fail to find version 'X" and log available version strings to
   # stderr. We then sort, remove bad versions and take the last entry. This
   # allows us to avoid hardcoding the main version number, which would then need