build(deps): bump h2 from 0.3.14 to 0.3.15 (#169)

Bumps [h2](https://github.com/hyperium/h2) from 0.3.14 to 0.3.15.
- [Release notes](https://github.com/hyperium/h2/releases)
- [Changelog](https://github.com/hyperium/h2/blob/master/CHANGELOG.md)
- [Commits](hyperium/h2@v0.3.14...v0.3.15)

---
updated-dependencies:
- dependency-name: h2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Kevin Leimkuhler <kevin@kleimkuhler.com>

Cargo.lock

@@ -140,9 +140,9 @@ dependencies = [
 
 [[package]]
 name = "h2"
-version = "0.3.14"
+version = "0.3.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5ca32592cf21ac7ccab1825cd87f6c9b3d9022c44d086172ed0966bec8af30be"
+checksum = "5f9f29bc9dda355256b2916cf526ab02ce0aeaaaf2bad60d65ef3f12f11dd0f4"
 dependencies = [
  "bytes",
  "fnv",