Upgrade to Solrcloud 9.6.1

What's Changed

• Bump oai_index from 68a7e55 to 5726e60 by @dependabot in #32
• Bump oai_index from 5726e60 to ed40222 by @dependabot in #33
• Bump oai_index from ed40222 to 93f86a2 by @dependabot in #34
• Bump oai_index from 93f86a2 to eaeb39b by @dependabot in #35
• Bump oai_index from eaeb39b to 1d31bfe by @dependabot in #36
• Bump oai_index from 1d31bfe to 6776aa3 by @dependabot in #37
• Bump oai_index from 6776aa3 to acf0f1b by @dependabot in #38
• Bump oai_index from acf0f1b to bd30793 by @dependabot in #39
• Update ruby version, 2.7.6 is past end of life by @sensei100 in #41
• Update docker-compose version by @sensei100 in #43
• Update ruby version and gems by @sensei100 in #44
• Add bundle platforms by @sensei100 in #45
• Bump rspec from 3.12.0 to 3.13.0 by @dependabot in #46
• Update cache versions for circleCI by @sensei100 in #48
• Update cache to v5 by @dkinzer in #50
• Update cache and pin base64 by @sensei100 in #52
• update cache to v7 by @dkinzer in #55
• Bump oai_index from 2021e06 to 2de372b by @dependabot in #54
• Bump rsolr from 2.5.0 to 2.6.0 by @dependabot in #57
• Bump base64 from 0.1.0 to 0.1.1 by @dependabot in #56
• Update ruby version and circle image by @sensei100 in #60
• Bump oai_index from 2de372b to 9c6738e by @dependabot in #62
• Bump oai_index from 9c6738e to 533ede0 by @dependabot in #63
• Updates to use solrcloud 9.6.1 by @sensei100 in #64

Full Changelog: 3...4