build(deps): bump sisimai from v4.25.16p1 to v5.0.0

Bumps [sisimai](https://github.com/sisimai/rb-sisimai) from v4.25.16p1 to v5.0.0.
- [Release notes](https://github.com/sisimai/rb-sisimai/releases)
- [Changelog](https://github.com/sisimai/rb-sisimai/blob/5-stable/ChangeLog.md)
- [Commits](sisimai/rb-sisimai@7d972e1...cd166bc)

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

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

Gemfile

@@ -3,7 +3,7 @@ source "https://rubygems.org"
 git_source(:github) { |name| "https://github.com/#{name}.git" }
 
 gem "sinatra"
-gem "sisimai", github: "sisimai/rb-sisimai", ref: "v4.25.16p1"
+gem "sisimai", github: "sisimai/rb-sisimai", ref: "v5.0.0"
 gem "webrick"
 
 group :test do

Gemfile.lock

@@ -1,9 +1,9 @@
 GIT
   remote: https://github.com/sisimai/rb-sisimai.git
-  revision: 7d972e18862ab2c07a181e2839b4e78505d9d2c8
-  ref: v4.25.16p1
+  revision: cd166bcb59b5929fa75d33df22fd0896f33e3eb2
+  ref: v5.0.0
   specs:
-    sisimai (4.25.16p1)
+    sisimai (5.0.0)
       oj (>= 3.0.0)
 
 GEM