bazel/util/pico_linker_scripts.bzl missing CcInfo load()

Newer Bazel versions removed the CcInfo symbol. ``` ERROR: [...]/external/pico-sdk+/bazel/util/pico_linker_scripts.bzl:27:9: The CcInfo symbol has been removed, add the following to your BUILD/bzl file: load("@rules_cc//cc/common:cc_info.bzl", "CcInfo") ``` The fix should be an explicit load() from rules_cc in pico_linker_scripts.bzl.