Reference: #255
Reference: golang/go#56494

Manual upgrade due to prior Go panic:

```console
$ go get golang.org/x/tools@v0.8.0
panic: internal error: can't find reason for requirement on golang.org/x/crypto@v0.0.0-20200622213623-75b288015ac9

goroutine 1 [running]:
cmd/go/internal/modget.(*resolver).updateBuildList.func1({{0x1400043ed80, 0x13}, {0x140000c2e70, 0x22}})
        /opt/homebrew/Cellar/go/1.20.3/libexec/src/cmd/go/internal/modget/get.go:1760 +0xc4
cmd/go/internal/modget.(*resolver).updateBuildList(0x1400007e000, {0x100f55398, 0x1400009e000}, {0x0, 0x0, 0x0})
        /opt/homebrew/Cellar/go/1.20.3/libexec/src/cmd/go/internal/modget/get.go:1765 +0x41c
cmd/go/internal/modget.(*resolver).resolveQueries(0x1400007e000, {0x100f55398, 0x1400009e000}, {0x140000b0090, 0x1, 0x10126bde0?})
        /opt/homebrew/Cellar/go/1.20.3/libexec/src/cmd/go/internal/modget/get.go:1243 +0x148
cmd/go/internal/modget.runGet({0x100f55398, 0x1400009e000}, 0x140000b8600?, {0x1400009a1a0, 0x1, 0x1})
        /opt/homebrew/Cellar/go/1.20.3/libexec/src/cmd/go/internal/modget/get.go:314 +0x38c
main.invoke(0x10125e3c0, {0x1400009a190, 0x2, 0x2})
        /opt/homebrew/Cellar/go/1.20.3/libexec/src/cmd/go/main.go:225 +0x37c
main.main()
        /opt/homebrew/Cellar/go/1.20.3/libexec/src/cmd/go/main.go:179 +0x7cc
```

Updated via:

```shell
go get golang.org/x/crypto@latest # panic workaround
go get golang.org/x/tools@v0.8.0
go mod tidy
go mod vendor
```

Introduces `xpasses/XR007` and `xpasses/XR008` test skips due to `golang.org/x/tools` now properly returning an error with invalid source files. This is expected with the suggested fixes implementation since those will intentionally remove source code, leaving the source code in an unbuildable state to encourage the developer to figure out the rest of the necessary solution.