chore(deps): bump handlebars from 4.1.5 to 4.1.6

Bumps [handlebars](https://github.com/sunng87/handlebars-rust) from 4.1.5 to 4.1.6.
- [Release notes](https://github.com/sunng87/handlebars-rust/releases)
- [Changelog](https://github.com/sunng87/handlebars-rust/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sunng87/handlebars-rust/compare/v4.1.5...v4.1.6)

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

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

Cargo.lock

@@ -1319,9 +1319,9 @@ checksum = "ac5956d4e63858efaec57e0d6c1c2f6a41e1487f830314a324ccd7e2223a7ca0"
 
 [[package]]
 name = "handlebars"
-version = "4.1.5"
+version = "4.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8ad84da8f63da982543fc85fcabaee2ad1fdd809d99d64a48887e2e942ddfe46"
+checksum = "167fa173496c9eadd8749cca6f8339ac88e248f3ad2442791d0b743318a94fc0"
 dependencies = [
  "log",
  "pest",

iox_data_generator/Cargo.toml

@@ -10,7 +10,7 @@ chrono = "0.4.13"
 chrono-english = "0.1.4"
 clap = "2.33.1"
 futures = "0.3.5"
-handlebars = "4.1.5"
+handlebars = "4.1.6"
 humantime = "2.1.0"
 data_types = { path = "../data_types" }
 generated_types = { path = "../generated_types" }