build(deps): Bump libm from 0.2.11 to 0.2.13 in /hermit-builtins

Bumps [libm](https://github.com/rust-lang/compiler-builtins) from 0.2.11 to 0.2.13.
- [Release notes](https://github.com/rust-lang/compiler-builtins/releases)
- [Changelog](https://github.com/rust-lang/compiler-builtins/blob/master/.release-plz.toml)
- [Commits](https://github.com/rust-lang/compiler-builtins/compare/libm-v0.2.11...libm-v0.2.13

)

---
updated-dependencies:
- dependency-name: libm
  dependency-version: 0.2.13
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

hermit-builtins/Cargo.lock

 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "hermit-builtins"
@@ -11,6 +11,6 @@ dependencies = [
 
 [[package]]
 name = "libm"
-version = "0.2.11"
+version = "0.2.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8355be11b20d696c8f18f6cc018c4e372165b1fa8126cef092399c9951984ffa"
+checksum = "c9627da5196e5d8ed0b0495e61e518847578da83483c37288316d9b2e03a7f72"