Bump restic/restic from 0.17.3 to 0.18.1

Bumps restic/restic from 0.17.3 to 0.18.1.

---
updated-dependencies:
- dependency-name: restic/restic
  dependency-version: 0.18.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Dockerfile

@@ -6,7 +6,7 @@ RUN go mod download
 COPY . .
 RUN go build
 
-FROM restic/restic:0.17.3
+FROM restic/restic:0.18.1
 RUN apk add --no-cache rclone bash curl docker-cli
 COPY --from=builder /app/autorestic /usr/bin/autorestic
 ENTRYPOINT []