go.toolchain.rev: bump Go toolchain

* Go toolchain: https://github.com/tailscale/go/compare/186053ab2af2ef8fc43f3c1d1150216e89d4aff0...7ef7b403648ac3a9481a6e88e8b894eff50b0167

Triggered by @bradfitz via the bumpdep workflow.

Updates tailscale/corp#50253

Signed-off-by: Dep Updater <noreply+dep-updater@tailscale.com>

flakehashes.json

@@ -1,10 +1,10 @@
 {
   "toolchain": {
-    "rev": "186053ab2af2ef8fc43f3c1d1150216e89d4aff0",
-    "sri": "sha256-JcOxcYFhNRg6fiQhe5GkPHQxLI0ypKClCShZcBY1920="
+    "rev": "7ef7b403648ac3a9481a6e88e8b894eff50b0167",
+    "sri": "sha256-sdlgTLTkdhTvGCeQTwAsR+Do8rNwBzBUp5QPc09BPgI="
   },
   "vendor": {
-    "goModSum": "sha256-tCuqUvgL9H3779uKw3AeSaToYcOy2aBhIWoSLOgs6T8=",
+    "goModSum": "sha256-DN+aQ2obBIjmj9TtvEA0+DYf+wIvpJ+MTg2+ZvYczkw=",
     "sri": "sha256-jrznfL26qyAGix9DVkmh0sLU2VvqeTNMdi6mPu9RlxM="
   }
 }

go.mod

@@ -1,6 +1,6 @@
 module tailscale.com
 
-go 1.27.2
+go 1.27.3
 
 require (
 	filippo.io/mkcert v1.4.4

go.toolchain.next.rev

@@ -1 +1 @@
-186053ab2af2ef8fc43f3c1d1150216e89d4aff0
+7ef7b403648ac3a9481a6e88e8b894eff50b0167

go.toolchain.rev

@@ -1 +1 @@
-186053ab2af2ef8fc43f3c1d1150216e89d4aff0
+7ef7b403648ac3a9481a6e88e8b894eff50b0167

go.toolchain.version

@@ -1 +1 @@
-1.27.2
+1.27.3