fix(exports): prefix relative paths with ./ (#905)

Author: gr2m

.changeset/nasty-terms-enjoy.md

@@ -0,0 +1,5 @@
+---
+'@primer/octicons': patch
+---
+
+prefix relative paths with `./` in ESM exports paths

lib/octicons_react/package.json

@@ -8,8 +8,8 @@
   "main": "dist/index.umd.js",
   "module": "dist/index.esm.js",
   "exports": {
-    "import": "dist/index.esm.js",
-    "require": "dist/index.umd.js"
+    "import": "./dist/index.esm.js",
+    "require": "./dist/index.umd.js"
   },
   "sideEffects": false,
   "types": "dist/index.d.ts",