Bump go 1.19: fix error when building tools such as benchmark

The pipeline error:
```
Building 'tools/benchmark'...
% 'rm' '-f' 'bin/tools/benchmark'
% 'env' 'GO_BUILD_FLAGS=-v' 'CGO_ENABLED=0' 'go' 'build' '-v' '-installsuffix=cgo' '-ldflags='\''-X=go.etcd.io/etcd/api/v3/version.GitSHA=01250c9'\''' '-o=bin/tools/benchmark' './tools/benchmark'
stderr: invalid value "'-X=go.etcd.io/etcd/api/v3/version.GitSHA=01250c9'" for flag -ldflags: parameter may not start with quote character '
stderr: usage: go build [-o output] [build flags] [packages]
stderr: Run 'go help build' for details.
FAIL: (code:2):
  % 'env' 'GO_BUILD_FLAGS=-v' 'CGO_ENABLED=0' 'go' 'build' '-v' '-installsuffix=cgo' '-ldflags='\''-X=go.etcd.io/etcd/api/v3/version.GitSHA=01250c9'\''' '-o=bin/tools/benchmark' './tools/benchmark'
FAIL: 'build' failed at Thu Sep 15 03:13:24 UTC 2022
```

It's caused by golang/go#43177. Previously
invalid -ldflags is silently ignored by go cmd. But it isn't ignored
anymore in go 1.19 due to the fix in PR
https://go-review.googlesource.com/c/go/+/339289.

Signed-off-by: Benjamin Wang <[email protected]>

scripts/build_lib.sh

@@ -93,7 +93,7 @@ tools_build() {
     # shellcheck disable=SC2086
     run env GO_BUILD_FLAGS="${GO_BUILD_FLAGS}" CGO_ENABLED=0 go build ${GO_BUILD_FLAGS} \
       -installsuffix=cgo \
-      "-ldflags='${GO_LDFLAGS[*]}'" \
+      "-ldflags=${GO_LDFLAGS[*]}" \
       -o="${out}/${tool}" "./${tool}" || return 2
   done
   tests_build "${@}"