Update databrickslabs/sandbox requirement to acceptance/v0.3.0

Updates the requirements on [databrickslabs/sandbox](https://github.com/databrickslabs/sandbox) to permit the latest version.
- [Release notes](https://github.com/databrickslabs/sandbox/releases)
- [Changelog](https://github.com/databrickslabs/sandbox/blob/main/CHANGELOG.md)
- [Commits](https://github.com/databrickslabs/sandbox/commits/acceptance/v0.3.0)

---
updated-dependencies:
- dependency-name: databrickslabs/sandbox
  dependency-type: direct:production
...

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

Author: dependabot[bot]

.github/workflows/acceptance.yml

@@ -45,7 +45,7 @@ jobs:
           git fetch origin $GITHUB_HEAD_REF:$GITHUB_HEAD_REF
 
       - name: Run integration tests
-        uses: databrickslabs/sandbox/acceptance@acceptance/v0.2.2
+        uses: databrickslabs/sandbox/acceptance@acceptance/v0.3.0
         with:
           vault_uri: ${{ secrets.VAULT_URI }}
           timeout: 55m

.github/workflows/downstreams.yml

@@ -48,7 +48,7 @@ jobs:
         run: |
           pip install hatch==1.9.4
       - name: Downstreams
-        uses: databrickslabs/sandbox/downstreams@downstreams/v0.0.1
+        uses: databrickslabs/sandbox/downstreams@acceptance/v0.3.0
         with:
           repo: ${{ matrix.downstream.name }}
           org: databrickslabs

.github/workflows/nightly.yml

@@ -35,7 +35,7 @@ jobs:
         run: pip install hatch==1.9.4
 
       - name: Run nightly tests
-        uses: databrickslabs/sandbox/acceptance@acceptance/v0.2.2
+        uses: databrickslabs/sandbox/acceptance@acceptance/v0.3.0
         with:
           vault_uri: ${{ secrets.VAULT_URI }}
           timeout: 55m