ci: renovate updates of buf build

Signed-off-by: Artsiom Koltun <artsiom.koltun@intel.com>

.github/renovate.json

@@ -5,13 +5,46 @@
 		":semanticCommitTypeAll(ci)"
 	],
 	"schedule": [
-    		"* 0 2 * *"
-  	],
+		"* 0 2 * *"
+	],
 	"packageRules": [
 		{
-			"matchUpdateTypes": ["digest"],
+			"matchUpdateTypes": [
+				"digest"
+			],
 			"automerge": true
+		},
+		{
+			"packageNames": [
+				"grpc/python"
+			],
+			"manager": "script",
+			"versioning": {
+				"matchScript": "jo page_size=250 | buf curl --schema=buf.build/bufbuild/buf --data @- https://buf.build/buf.alpha.registry.v1alpha1.PluginCurationService/ListCuratedPlugins | jq -r '.plugins[] | .owner + \"/\" + .name + \":\" + .version' | grep grpc",
+				"extractVersion": "jq -r .version"
+			}
+		}
+	],
+	"regexManagers": [
+		{
+			"fileMatch": [
+				"(^|\\/)buf.gen.yaml"
+			],
+			"matchStrings": [
+				"grpc/python:(?<currentValue>.*?)\\s"
+			],
+			"datasourceTemplate": "github-tags",
+			"depNameTemplate": "grpc/grpc"
+		},
+		{
+			"fileMatch": [
+				"(^|\\/)buf.gen.yaml"
+			],
+			"matchStrings": [
+				"protocolbuffers/python:(?<currentValue>.*?)\\s"
+			],
+			"datasourceTemplate": "github-tags",
+			"depNameTemplate": "protocolbuffers/protobuf"
 		}
 	]
-}
-
+}