Bump platforms from 3.0.2 to 3.4.1

Bumps [platforms](https://github.com/rustsec/rustsec) from 3.0.2 to 3.4.1.
- [Release notes](https://github.com/rustsec/rustsec/releases)
- [Commits](https://github.com/rustsec/rustsec/commits)

---
updated-dependencies:
- dependency-name: platforms
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Cargo.toml

@@ -1019,7 +1019,7 @@ people-rococo-runtime = { path = "cumulus/parachains/runtimes/people/people-roco
 people-westend-emulated-chain = { path = "cumulus/parachains/integration-tests/emulated/chains/parachains/people/people-westend" }
 people-westend-runtime = { path = "cumulus/parachains/runtimes/people/people-westend" }
 pin-project = { version = "1.1.3" }
-platforms = { version = "3.0" }
+platforms = { version = "3.4" }
 polkadot-approval-distribution = { path = "polkadot/node/network/approval-distribution", default-features = false }
 polkadot-availability-bitfield-distribution = { path = "polkadot/node/network/bitfield-distribution", default-features = false }
 polkadot-availability-distribution = { path = "polkadot/node/network/availability-distribution", default-features = false }