chore: fix main entry field in package.json

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
  - task: lint_filenames
    status: passed
  - task: lint_editorconfig
    status: passed
  - task: lint_markdown
    status: na
  - task: lint_package_json
    status: passed
  - task: lint_repl_help
    status: na
  - task: lint_javascript_src
    status: na
  - task: lint_javascript_cli
    status: na
  - task: lint_javascript_examples
    status: na
  - task: lint_javascript_tests
    status: na
  - task: lint_javascript_benchmarks
    status: na
  - task: lint_python
    status: na
  - task: lint_r
    status: na
  - task: lint_c_src
    status: na
  - task: lint_c_examples
    status: na
  - task: lint_c_benchmarks
    status: na
  - task: lint_c_tests_fixtures
    status: na
  - task: lint_shell
    status: na
  - task: lint_typescript_declarations
    status: na
  - task: lint_typescript_tests
    status: na
  - task: lint_license_headers
    status: passed
---

Author: Planeshifter

lib/node_modules/@stdlib/namespace/package.json

@@ -16,7 +16,7 @@
   "bin": {
     "stdlib-namespace": "./bin/cli"
   },
-  "main": "./lib/index.js",
+  "main": "./lib",
   "directories": {
     "benchmark": "./benchmark",
     "doc": "./docs",

lib/node_modules/@stdlib/string/base/slice-code-points/package.json

@@ -13,7 +13,7 @@
       "url": "https://github.com/stdlib-js/stdlib/graphs/contributors"
     }
   ],
-  "main": "./lib/main.js",
+  "main": "./lib",
   "directories": {
     "benchmark": "./benchmark",
     "doc": "./docs",