build(deps): bump the tensorflow group across 1 directory with 3 updates

Bumps the tensorflow group with 3 updates in the / directory: [@tensorflow/tfjs-core](https://github.com/tensorflow/tfjs/tree/HEAD/tfjs-core), [@tensorflow/tfjs](https://github.com/tensorflow/tfjs) and [@tensorflow/tfjs-node](https://github.com/tensorflow/tfjs/tree/HEAD/tfjs-node).


Updates `@tensorflow/tfjs-core` from 4.4.0 to 4.21.0
- [Release notes](https://github.com/tensorflow/tfjs/releases)
- [Changelog](https://github.com/tensorflow/tfjs/blob/master/cloudbuild-release.yml)
- [Commits](https://github.com/tensorflow/tfjs/commits/HEAD/tfjs-core)

Updates `@tensorflow/tfjs` from 4.4.0 to 4.21.0
- [Release notes](https://github.com/tensorflow/tfjs/releases)
- [Changelog](https://github.com/tensorflow/tfjs/blob/master/cloudbuild-release.yml)
- [Commits](https://github.com/tensorflow/tfjs/commits)

Updates `@tensorflow/tfjs-node` from 4.4.0 to 4.21.0
- [Release notes](https://github.com/tensorflow/tfjs/releases)
- [Changelog](https://github.com/tensorflow/tfjs/blob/master/cloudbuild-release.yml)
- [Commits](https://github.com/tensorflow/tfjs/commits/HEAD/tfjs-node)

---
updated-dependencies:
- dependency-name: "@tensorflow/tfjs-core"
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: tensorflow
- dependency-name: "@tensorflow/tfjs"
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: tensorflow
- dependency-name: "@tensorflow/tfjs-node"
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: tensorflow
...

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

package.json

@@ -77,6 +77,6 @@
 		"start-server-and-test": "2.0.4"
 	},
 	"optionalDependencies": {
-		"@tensorflow/tfjs-core": "4.4.0"
+		"@tensorflow/tfjs-core": "4.21.0"
 	}
 }

packages/backend/package.json

@@ -47,8 +47,8 @@
 		"@swc/core-win32-arm64-msvc": "1.3.56",
 		"@swc/core-win32-ia32-msvc": "1.3.56",
 		"@swc/core-win32-x64-msvc": "1.3.56",
-		"@tensorflow/tfjs": "4.4.0",
-		"@tensorflow/tfjs-node": "4.4.0",
+		"@tensorflow/tfjs": "4.21.0",
+		"@tensorflow/tfjs-node": "4.21.0",
 		"bufferutil": "4.0.7",
 		"slacc-android-arm-eabi": "0.0.10",
 		"slacc-android-arm64": "0.0.10",