Merge pull request #6279 from rubygems/dependabot/cargo/test/rubygems/test_gem_ext_cargo_builder/custom_name/rb-sys-0.9.56

Bump rb-sys from 0.9.54 to 0.9.56 in /test/rubygems/test_gem_ext_cargo_builder/custom_name

(cherry picked from commit 6c36a5a)

Author: hsbt

test/rubygems/test_gem_ext_cargo_builder/custom_name/ext/custom_name_lib/Cargo.lock

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