Bump botocore from 1.15.21 to 1.15.23 (pypi#7558)

Bumps [botocore](https://github.com/boto/botocore) from 1.15.21 to 1.15.23.
- [Release notes](https://github.com/boto/botocore/releases)
- [Changelog](https://github.com/boto/botocore/blob/develop/CHANGELOG.rst)
- [Commits](boto/botocore@1.15.21...1.15.23)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: Dustin Ingram <di@users.noreply.github.com>

requirements/main.txt

@@ -57,9 +57,9 @@ bleach==3.1.3 \
 boto3==1.12.21 \
     --hash=sha256:50105a25e301e20b361b2b8fafee196a425a4758e51f400a0f381d42e4bd909e \
     --hash=sha256:5fe70e656f92e4e649dc4cf05786f57d180e5d491bcb22c80411512ec2b27c15
-botocore==1.15.21 \
-    --hash=sha256:4aaf6c94bcaace260138d32eae144be1b5d2ddce9ef0f395da32c68e106ff20f \
-    --hash=sha256:86f7f1c489887f9e3c2ede598e2a30f8bd259c11e8ebe25e897e40231b3f4bc8
+botocore==1.15.23 \
+    --hash=sha256:5b6bf68bd484fbf83e27f56a0a92e38cee223b689121c1184a0292311b88f888 \
+    --hash=sha256:e4fc86574043b20267f863b9168bd1c9ed50a53f0f7222ce8c99f64355174515
 cachetools==4.0.0 \
     --hash=sha256:9a52dd97a85f257f4e4127f15818e71a0c7899f121b34591fcc1173ea79a0198 \
     --hash=sha256:b304586d357c43221856be51d73387f93e2a961598a9b6b6670664746f3b6c6c