deps: Update golang.org/x/tools@v0.8.0

[bflad]

Closes #255 Reference: https://github.com/golang/go/issues/56494

Manual upgrade due to prior Go panic:

$ 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:

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.