[rubygems/rubygems] Bump rb-sys

Bumps [rb-sys](https://github.com/oxidize-rb/rb-sys) from 0.9.54 to 0.9.56.
- [Release notes](https://github.com/oxidize-rb/rb-sys/releases)
- [Commits](https://github.com/oxidize-rb/rb-sys/compare/v0.9.54...v0.9.56)

---
updated-dependencies:
- dependency-name: rb-sys
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

test/rubygems/test_gem_ext_cargo_builder/rust_ruby_example/Cargo.lock

@@ -144,18 +144,18 @@ dependencies = [
 
 [[package]]
 name = "rb-sys"
-version = "0.9.54"
+version = "0.9.56"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b3277448b8eee18de8bedb18883ae02dcd60d47922ddfc6ab408def77da0a9b4"
+checksum = "ef82428221475c6f9e7893fe30b88d45ac86bdb12e58e7c92055ba4bceb78a69"
 dependencies = [
  "rb-sys-build",
 ]
 
 [[package]]
 name = "rb-sys-build"
-version = "0.9.54"
+version = "0.9.56"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c9baae802c93180af02cccb21819589d109070f8e28e14e7070a9ffdeca9b464"
+checksum = "950bfc239d2e7704576abe4d37b008876bbfd70a99196a188c5caeae2ba7344a"
 dependencies = [
  "bindgen",
  "regex",

test/rubygems/test_gem_ext_cargo_builder/rust_ruby_example/Cargo.toml

@@ -7,4 +7,4 @@ edition = "2021"
 crate-type = ["cdylib"]
 
 [dependencies]
-rb-sys = "0.9.54"
+rb-sys = "0.9.56"