perf: add cache-build option and upgrade to v6.2.0

Add `cache-build` input (default: false) to control whether GOCACHE is
included in the cache. This dramatically reduces cache size from ~1.2GB
to ~200-400MB by excluding build artifacts that have low reuse across
code changes.

Also upgrades dependencies (@actions/cache v5, semver v7.7) and runtime
to node24 to align with upstream actions/setup-go.

https://claude.ai/code/session_01CqrWSjzGgd7Zi6LyJkd9XW

package.json

@@ -1,6 +1,6 @@
 {
   "name": "setup-go",
-  "version": "5.0.0",
+  "version": "6.2.0",
   "private": true,
   "description": "setup go action",
   "main": "lib/setup-go.js",
@@ -25,18 +25,18 @@
   "author": "GitHub",
   "license": "MIT",
   "dependencies": {
-    "@actions/cache": "^4.0.3",
+    "@actions/cache": "^5.0.1",
     "@actions/core": "^1.11.1",
     "@actions/exec": "^1.1.1",
     "@actions/glob": "^0.5.0",
     "@actions/http-client": "^2.2.1",
     "@actions/io": "^1.0.2",
-    "@actions/tool-cache": "^2.0.1",
-    "semver": "^7.6.3"
+    "@actions/tool-cache": "^2.0.2",
+    "semver": "^7.7.3"
   },
   "devDependencies": {
     "@types/jest": "^29.5.12",
-    "@types/node": "^20.11.28",
+    "@types/node": "^22.15.3",
     "@types/semver": "^7.5.8",
     "@typescript-eslint/eslint-plugin": "^8.31.1",
     "@typescript-eslint/parser": "^8.31.1",