internal/warpc: Increase WebP memory limit to 256 MiB

Closes #14282


---------

Co-authored-by: Bjørn Erik Pedersen <bjorn.erik.pedersen@gmail.com>

Author: jmooring

hugolib/site.go

@@ -265,7 +265,8 @@ func NewHugoSites(cfg deps.DepsCfg) (*HugoSites, error) {
 			// WebP options.
 			warpc.Options{
 				CompilationCacheDir: compilationCacheDir,
-				PoolSize:            2,
+				PoolSize:            1,
+				Memory:              256, // 256 MiB (4096 MiB Max)
 				Infof:               logger.InfoCommand("webp").Logf,
 				Warnf:               logger.WarnCommand("webp").Logf,
 			},

internal/warpc/warpc.go

@@ -575,8 +575,7 @@ func newDispatcher[Q, R any](opts Options) (*dispatcherPool[Q, R], error) {
 	}
 
 	if opts.Memory <= 0 {
-		// 32 MiB
-		opts.Memory = 32
+		opts.Memory = 32 // 32 MiB
 	}
 
 	ctx := opts.Ctx