chore(foundryup): default to stable if no specific version is passe…

…d in (#9585)

* default to stable if no specific version is passed in

* update mention, defaults to stable now

foundryup/foundryup

@@ -89,7 +89,7 @@ main() {
 
   # Install by downloading binaries
   if [[ "$FOUNDRYUP_REPO" == "foundry-rs/foundry" && -z "$FOUNDRYUP_BRANCH" && -z "$FOUNDRYUP_COMMIT" ]]; then
-    FOUNDRYUP_VERSION=${FOUNDRYUP_VERSION:-nightly}
+    FOUNDRYUP_VERSION=${FOUNDRYUP_VERSION:-stable}
     FOUNDRYUP_TAG=$FOUNDRYUP_VERSION
 
     # Normalize versions (handle channels, versions without v prefix
@@ -244,7 +244,7 @@ The installer for Foundry.
 
 Update or revert to a specific Foundry version with ease.
 
-By default, the latest nightly version is installed from built binaries.
+By default, the latest stable version is installed from built binaries.
 
 USAGE:
     foundryup <OPTIONS>