Bump serde_json from 1.0.66 to 1.0.67 (#3767)

Bumps [serde_json](https://github.com/serde-rs/json) from 1.0.66 to 1.0.67.
- [Release notes](https://github.com/serde-rs/json/releases)
- [Commits](https://github.com/serde-rs/json/compare/v1.0.66...v1.0.67)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
15 jobs for master in 21 minutes (queued for 13 seconds)
Name Stage Failure
failed
check-transaction-versions Build
2021-09-02 09:39:40 👶 Creating empty BABE epoch changes on what appears to be first startup.    
2021-09-02 09:39:40 🏷 Local node identity is: 12D3KooWD17qKbsAFQB69iDWhmoUJDi2aGBn5XMQ9c6UqL5XC4Wn
2021-09-02 09:39:40 📦 Highest known block at #0
2021-09-02 09:39:40 〽️ Prometheus exporter started at 127.0.0.1:9615
2021-09-02 09:39:40 Listening for new connections on 127.0.0.1:9945.
2021-09-02 09:39:45 💤 Idle (0 peers), best: #0 (0x9170…8589), finalized #0 (0x9170…8589), ⬇ 0 ⬆ 0
[!] Both nodes not listening after 5 seconds. Exiting
Cleaning up file based variables
ERROR: Job failed: exit code 1
failed
test-build-linux-stable Test
test result: FAILED. 16 passed; 2 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.26s

error: test failed, to rerun pass '-p polkadot-availability-recovery --lib'

real 16m32.259s
user 118m58.545s
sys 4m42.362s
Cleaning up file based variables
ERROR: Job failed: exit code 1