chore: update dependencies and workflow actions

- Update GitHub Actions to latest versions (checkout v6, setup-node v6, cache v4.3)
- Update package dependencies
- Format workflow files
- Update .gitignore and project configuration

.serena/project.yml

@@ -1,8 +1,6 @@
----
-language: cpp
 ignore_all_files_in_gitignore: true
 ignored_paths:
-  - megalinter-reports
+- megalinter-reports
 read_only: false
 
 # list of tool names to exclude. We recommend not excluding any tools, see the readme for more details.
@@ -47,3 +45,9 @@ read_only: false
 excluded_tools: []
 initial_prompt: ""
 project_name: "tree-sitter-shellspec"
+languages:
+- cpp
+- typescript
+- bash
+included_optional_tools: []
+encoding: utf-8