chore(deps): update yoheimuta/protolint docker tag to v0.56.4 (#110)

| datasource | package             | from   | to     |
| ---------- | ------------------- | ------ | ------ |
| docker     | yoheimuta/protolint | 0.55.6 | 0.56.4 |

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

Author: renovate[bot]

protolint/dagger/main.go

@@ -14,7 +14,7 @@ func New(
 	// Protolint image to use.
 	// +optional
 	// renovate image: datasource=docker depName=yoheimuta/protolint versioning=docker
-	// +default="yoheimuta/protolint:0.55.6"
+	// +default="yoheimuta/protolint:0.56.4"
 	Image string,
 ) *Protolint {
 	return &Protolint{