@web5/dids add missing dependency

[mistermoe]

The following error occurs when attempting to use a package that has @web5/dids as a dependency:

node:internal/errors:496
    ErrorCaptureStackTrace(err);
    ^

Error [ERR_MODULE_NOT_FOUND]: Cannot find package 'ms' imported from /Users/moe/code/tmp/try-tbdex/node_modules/@web5/dids/dist/esm/resolver-cache-level.js
    at new NodeError (node:internal/errors:405:5)
    at packageResolve (node:internal/modules/esm/resolve:782:9)
    at moduleResolve (node:internal/modules/esm/resolve:831:20)
    at defaultResolve (node:internal/modules/esm/resolve:1036:11)
    at DefaultModuleLoader.resolve (node:internal/modules/esm/loader:251:12)
    at DefaultModuleLoader.getModuleJob (node:internal/modules/esm/loader:140:32)
    at ModuleWrap.<anonymous> (node:internal/modules/esm/module_job:76:33)
    at link (node:internal/modules/esm/module_job:75:36) {
  code: 'ERR_MODULE_NOT_FOUND'
}

This PR adds ms as a dependency for @web5/dids

[frankhinek]

LGTM