Update CODEOWNERS for keynote_bench.rs (#5182)

# Description of Changes

Making @joshua-spacetime a CODEOWNER of this instead of me.

# API and ABI breaking changes

<!-- If this is an API or ABI breaking change, please apply the
corresponding GitHub label. -->

# Expected complexity level and risk

1

# Testing

None tbh

Co-authored-by: Zeke Foppa <bfops@users.noreply.github.com>

Author: bfops

.github/CODEOWNERS

@@ -7,6 +7,7 @@ LICENSE.txt @cloutiertyler
 
 /crates/cli/src/ @bfops @cloutiertyler @jdetter
 /tools/ci/ @bfops @cloutiertyler @jdetter
+/tools/ci/src/keynote_bench.rs @joshua-spacetime @cloutiertyler @jdetter
 /tools/upgrade-version/ @bfops @jdetter @cloutiertyler
 /tools/license-check/ @bfops @jdetter @cloutiertyler
 /.github/ @bfops @jdetter @cloutiertyler