Update elasticsearch requirement from <8,>=7 to >=7,<9

[dependabot[bot]]

Updates the requirements on elasticsearch to permit the latest version.

Release notes

Sourced from elasticsearch's releases.

8.12.1

• Fixed but deprecated parameter aliases in body parameter (#2427)
• Added mappings and bulk to quickstart page (#2417)

Commits

• 970ce1c Release 8.12.1
• 5ca24e3 Fix example generation (#2449) (#2452)
• 2b86966 Fix but deprecate parameter aliases in body parameter (#2427) (#2447)
• 6575d62 Use unquote() directly instead of wrapper (#2415) (#2431)
• 914021f Restore .ci/make.sh file (#2437) (#2441)
• ac52679 Add mappings and bulk to quickstart page (#2417) (#2434)
• 5dbb87b Switch to 2024 black style (#2430) (#2432)
• 2f9e42d Release 8.12.0
• 037b84f Update 8.11.1 release notes (#2418)
• 8228e5b Drop support for Python 3.6 (#2268) (#2414)
• Additional commits viewable in compare view

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[ambv]

This won't work without a new release from django-heystack. We're currently on the newest released version of that, so this has to wait for better times.

[dependabot[bot]]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.