chore(deps): update ubuntu:22.04 docker digest to 6d7b5d3 (#318)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

synapse_rock/rockcraft.yaml

@@ -6,9 +6,9 @@ summary: Synapse rock
 description: Synapse OCI image for the Synapse charm
 version: "1.0"
 base: [email protected]
-# renovate: base: ubuntu:22.04@sha256:1b8d8ff4777f36f19bfe73ee4df61e3a0b789caeff29caa019539ec7c9a57f95
+# renovate: base: ubuntu:22.04@sha256:6d7b5d3317a71adb5e175640150e44b8b9a9401a7dd394f44840626aff9fa94d
 build-base: [email protected]
-# renovate: build-base: ubuntu:22.04@sha256:1b8d8ff4777f36f19bfe73ee4df61e3a0b789caeff29caa019539ec7c9a57f95
+# renovate: build-base: ubuntu:22.04@sha256:6d7b5d3317a71adb5e175640150e44b8b9a9401a7dd394f44840626aff9fa94d
 license: Apache-2.0
 platforms:
   amd64: