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

.github/workflows/tests.yml

@@ -19,7 +19,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        go-version: [1.22.x]
+        go-version: [1.25.x]
     runs-on: ${{ matrix.os }}
     steps:
       - name: Install Go