[release-branch.go1.26] cmd: re-vendor x/tools for Go 1.26.1

Update x/tools vendor to the tip of internal-branch.go1.26-vendor
branch (642dd50), to pull in recent fixes of the modernizer. Done
by

cd GOROOT/cmd
go get golang.org/x/tools@internal-branch.go1.26-vendor
go mod tidy
go mod vendor

Fixes golang#77766
Fixes golang#77803
Fixes golang#77804
Fixes golang#77805
Fixes golang#77807
Fixes golang#77849
Fixes golang#77899
Fixes golang#77904

Change-Id: Id7aa8c2247949bdc104898270a4ceb3eee68a818
Reviewed-on: https://go-review.googlesource.com/c/go/+/750761
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Alan Donovan <adonovan@google.com>

Author: cherrymui

src/cmd/go.mod

@@ -11,7 +11,7 @@ require (
 	golang.org/x/sys v0.39.0
 	golang.org/x/telemetry v0.0.0-20251128220624-abf20d0e57ec
 	golang.org/x/term v0.38.0
-	golang.org/x/tools v0.39.1-0.20260217205208-88886dd9587b
+	golang.org/x/tools v0.39.1-0.20260302211140-642dd50cb7cc
 )
 
 require (

src/cmd/go.sum

@@ -22,7 +22,7 @@ golang.org/x/term v0.38.0 h1:PQ5pkm/rLO6HnxFR7N2lJHOZX6Kez5Y1gDSJla6jo7Q=
 golang.org/x/term v0.38.0/go.mod h1:bSEAKrOT1W+VSu9TSCMtoGEOUcKxOKgl3LE5QEF/xVg=
 golang.org/x/text v0.32.0 h1:ZD01bjUt1FQ9WJ0ClOL5vxgxOI/sVCNgX1YtKwcY0mU=
 golang.org/x/text v0.32.0/go.mod h1:o/rUWzghvpD5TXrTIBuJU77MTaN0ljMWE47kxGJQ7jY=
-golang.org/x/tools v0.39.1-0.20260217205208-88886dd9587b h1:eAvGtZBetn9/vYF11p6xXS7Wug5moPBH4j+kgEIZWig=
-golang.org/x/tools v0.39.1-0.20260217205208-88886dd9587b/go.mod h1:JnefbkDPyD8UU2kI5fuf8ZX4/yUeh9W877ZeBONxUqQ=
+golang.org/x/tools v0.39.1-0.20260302211140-642dd50cb7cc h1:RzEk8N4Q57niCI1HA49wovYfk90ufvZo8j3JA87GZH8=
+golang.org/x/tools v0.39.1-0.20260302211140-642dd50cb7cc/go.mod h1:JnefbkDPyD8UU2kI5fuf8ZX4/yUeh9W877ZeBONxUqQ=
 rsc.io/markdown v0.0.0-20240306144322-0bf8f97ee8ef h1:mqLYrXCXYEZOop9/Dbo6RPX11539nwiCNBb1icVPmw8=
 rsc.io/markdown v0.0.0-20240306144322-0bf8f97ee8ef/go.mod h1:8xcPgWmwlZONN1D9bjxtHEjrUtSEa3fakVF8iaewYKQ=