build: go 1.24

We were running behind and there were quite some deprecations to update.
This was mostly in the upstream copy/pasta package but seems quite
minimal.

vendor/google.golang.org/grpc/service_config.go

@@ -268,18 +268,21 @@ func parseServiceConfig(js string, maxAttempts int) *serviceconfig.ParseResult {
 	return &serviceconfig.ParseResult{Config: &sc}
 }
 
+func isValidRetryPolicy(jrp *jsonRetryPolicy) bool {
+	return jrp.MaxAttempts > 1 &&
+		jrp.InitialBackoff > 0 &&
+		jrp.MaxBackoff > 0 &&
+		jrp.BackoffMultiplier > 0 &&
+		len(jrp.RetryableStatusCodes) > 0
+}
+
 func convertRetryPolicy(jrp *jsonRetryPolicy, maxAttempts int) (p *internalserviceconfig.RetryPolicy, err error) {
 	if jrp == nil {
 		return nil, nil
 	}
 
-	if jrp.MaxAttempts <= 1 ||
-		jrp.InitialBackoff <= 0 ||
-		jrp.MaxBackoff <= 0 ||
-		jrp.BackoffMultiplier <= 0 ||
-		len(jrp.RetryableStatusCodes) == 0 {
-		logger.Warningf("grpc: ignoring retry policy %v due to illegal configuration", jrp)
-		return nil, nil
+	if !isValidRetryPolicy(jrp) {
+		return nil, fmt.Errorf("invalid retry policy (%+v): ", jrp)
 	}
 
 	if jrp.MaxAttempts < maxAttempts {