v3.10.0b2: final testing before 3.10 release

Merge pull request #431 from django-haystack/pre-commit-ci-update-config

[pre-commit.ci] pre-commit autoupdate

v3.9.0

• Improved SolrCloud support
• Support for Solr.ping
• Dropped support for Python 3.4
• Added JSON interface which can be significantly faster

v3.8.1

• extract() handles spaces and special characters in filenames
• Python set() instances are handled automatically just like lists
• Updates no longer commit by default

3.2.0

• Better XML serialization: see 0b1fb09
• Update content extraction for newer versions of Solr - see #104, #96, #90
• Test updates