Update octokit requirement from >= 4.15, < 7.0 to >= 4.15, < 8.0

Updates the requirements on [octokit](https://github.com/octokit/octokit.rb) to permit the latest version.
- [Release notes](https://github.com/octokit/octokit.rb/releases)
- [Changelog](https://github.com/octokit/octokit.rb/blob/main/RELEASE.md)
- [Commits](octokit/octokit.rb@v6.1.1...v7.0.0)

---
updated-dependencies:
- dependency-name: octokit
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Gemfile.lock

@@ -3,7 +3,7 @@ PATH
  specs:
  sparrow (0.1.0)
  google-cloud-pubsub (>= 1.6, < 3.0)
- octokit (>= 4.15, < 7.0)
+ octokit (>= 4.15, < 8.0)
  ougai (>= 1.8, < 3.0)
  sentry-ruby (>= 4, < 6)
 
@@ -17,7 +17,7 @@ GEM
  crack (0.4.5)
  rexml
  diff-lcs (1.5.0)
- faraday (2.7.4)
+ faraday (2.7.10)
  faraday-net_http (>= 2.0, < 3.1)
  ruby2_keywords (>= 0.0.4)
  faraday-net_http (3.0.2)
@@ -77,7 +77,7 @@ GEM
  language_server-protocol (3.17.0.3)
  memoist (0.16.2)
  multi_json (1.15.0)
- octokit (6.1.1)
+ octokit (7.0.0)
  faraday (>= 1, < 3)
  sawyer (~> 0.9)
  oj (3.14.2)
@@ -88,7 +88,7 @@ GEM
  parser (3.2.2.3)
  ast (~> 2.4.1)
  racc
- public_suffix (5.0.1)
+ public_suffix (5.0.3)
  racc (1.7.1)
  rainbow (3.1.1)
  rake (13.0.6)

sparrow.gemspec

@@ -44,7 +44,7 @@ Gem::Specification.new do |spec|
  spec.require_paths = ["lib"]
 
  spec.add_dependency "google-cloud-pubsub", ">= 1.6", "< 3.0"
- spec.add_dependency "octokit", ">= 4.15", "< 7.0"
+ spec.add_dependency "octokit", ">= 4.15", "< 8.0"
  spec.add_dependency "ougai", ">= 1.8", "< 3.0"
  spec.add_dependency "sentry-ruby", ">= 4", "< 6"