Bump bricks to v0.0.21 (#430)

This includes:
* Pass caller information via `BRICKS_UPSTREAM` and
`BRICKS_UPSTREAM_VERSION`
* Reload .gitignore files if they have changed while sync is running

Author: pietern

packages/databricks-vscode/package.json

@@ -584,7 +584,7 @@
     "scripts": {
         "vscode:prepublish": "rm -rf out && yarn run package:compile && yarn run package:copy-webview-toolkit",
         "package": "vsce package",
-        "package:cli:fetch": "BRICKS_VERSION=0.0.20 && bash ./scripts/fetch-bricks-cli.sh ${BRICKS_VERSION} ${BRICKS_ARCH:-}",
+        "package:cli:fetch": "BRICKS_VERSION=0.0.21 && bash ./scripts/fetch-bricks-cli.sh ${BRICKS_VERSION} ${BRICKS_ARCH:-}",
         "package:cli:link": "rm -f ./bin/bricks && ln -s ../../../../bricks/bricks bin",
         "package:compile": "yarn run esbuild:base",
         "package:copy-webview-toolkit": "cp ./node_modules/@vscode/webview-ui-toolkit/dist/toolkit.js ./out/toolkit.js",