Update spyke requirement from >= 5.3.4, < 6.2.0 to >= 5.3.4, < 7.2.0

Updates the requirements on [spyke](https://github.com/balvig/spyke) to permit the latest version.
- [Release notes](https://github.com/balvig/spyke/releases)
- [Commits](balvig/spyke@v5.3.4...v6.1.3)

---
updated-dependencies:
- dependency-name: spyke
  dependency-type: direct:production
...

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

zaikio-hub.gemspec

@@ -25,6 +25,6 @@ Gem::Specification.new do |spec|
   spec.add_dependency "jwt", ">= 2.2.1", "< 2.8.0"
   spec.add_dependency "multi_json", ">= 1.14.1", "< 1.16.0"
   spec.add_dependency "oj", ">= 3.10.5", "< 3.16.0"
-  spec.add_dependency "spyke", ">= 5.3.4", "< 6.2.0"
+  spec.add_dependency "spyke", ">= 5.3.4", "< 7.2.0"
   spec.add_dependency "zaikio-client-helpers", "~> 0.4"
 end