all: update the x/tools dependency to fix the build with Go 1.25 (#432)

An unfortunate bug caused a number of packages in old x/tools versions
to fail to build with Go 1.25 (https://go.dev/issue/74462). Fix this
minimally by updating to the lowest patched version with the fix:
v0.24.1. This should allow wire to continue building with the same range
of Go versions as it could build with before (down to 1.19).

Also:
- Update the go.mod go directive to Go 1.19 to allow for module graph
  pruning, and to be consistent with the minimum build version.
- Fix a test that is broken in recent Go versions due to an error
  message change.
- Update tests to run on Go 1.25.x (the most recent version of Go).
- Remove coverage, since coverage upload wasn't working anyway.

Fixes #431

go.mod

@@ -1,10 +1,15 @@
 module github.com/google/wire
 
-go 1.12
+go 1.19
 
 require (
-	github.com/google/go-cmp v0.2.0
+	github.com/google/go-cmp v0.6.0
 	github.com/google/subcommands v1.2.0
 	github.com/pmezard/go-difflib v1.0.0
-	golang.org/x/tools v0.17.0
+	golang.org/x/tools v0.24.1
+)
+
+require (
+	golang.org/x/mod v0.20.0 // indirect
+	golang.org/x/sync v0.8.0 // indirect
 )