[rubygems/rubygems] Bump rb-sys

Bumps [rb-sys](https://github.com/oxidize-rb/rb-sys) from 0.9.19 to 0.9.20.
- [Release notes](https://github.com/oxidize-rb/rb-sys/releases)
- [Commits](https://github.com/oxidize-rb/rb-sys/compare/v0.9.19...v0.9.20)

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

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

https://github.com/rubygems/rubygems/commit/ee2facb8f2

test/rubygems/test_gem_ext_cargo_builder/rust_ruby_example/Cargo.lock

@@ -153,9 +153,9 @@ dependencies = [
 
 [[package]]
 name = "rb-sys"
-version = "0.9.19"
+version = "0.9.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8df6990035ed930322a6b8a73783ea6af88acffd2b4322932b0eb0766a5a8673"
+checksum = "0bfe4bf82794b8d3c995847a710da279afcd3bee40b993cd3296af259e5933c4"
 dependencies = [
  "bindgen",
  "linkify",
@@ -164,9 +164,9 @@ dependencies = [
 
 [[package]]
 name = "rb-sys-build"
-version = "0.9.19"
+version = "0.9.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a9c3c88da760bbc2f26bbfd1acbfe9de3faa87be55feaf3413a33539d066ff3c"
+checksum = "bb614fa1ac5a7a96685537f123201b727dfa39e7e54e46c1027b3477266be93d"
 dependencies = [
  "regex",
  "shell-words",

test/rubygems/test_gem_ext_cargo_builder/rust_ruby_example/Cargo.toml

@@ -7,4 +7,4 @@ edition = "2021"
 crate-type = ["cdylib"]
 
 [dependencies]
-rb-sys = { version = "0.9.19", features = ["gem"] }
+rb-sys = { version = "0.9.20", features = ["gem"] }