Update dependency cssnano to v7

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| grafana/tempo | digest | `35b5ca6` -> `8b14474` |

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### Configuration

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Reviewed-on: #42
Co-authored-by: Renovate Bot <renovate-bot@valverde.cloud>
Co-committed-by: Renovate Bot <renovate-bot@valverde.cloud>

compose.yml

@@ -48,7 +48,7 @@ services:
 
   tempo:
     <<: *service-base
-    image: grafana/tempo:latest@sha256:35b5ca6fcb937ca60df5cc138d798a3381b0b31c3b5d78cc0dcc20f4490d5032
+    image: grafana/tempo:latest@sha256:8b1447438058ca1307ecf55689ed3da944037cc8918664701b95fa18cdaa1b2c
     command: [-config.file=/etc/tempo.yaml]
     volumes:
       - ./telemetry/tempo.yaml:/etc/tempo.yaml

packages/webapp/public/98.css/package.json

@@ -27,7 +27,7 @@
   "homepage": "https://github.com/jdan/98.css",
   "devDependencies": {
     "chokidar": "^3.3.1",
-    "cssnano": "^5.0.1",
+    "cssnano": "^7.0.0",
     "dedent": "^0.7.0",
     "ejs": "^3.0.2",
     "gh-pages": "^2.2.0",