fix : Updated spdx_header.txt

[iamnandhu]

Updated the year of copyright info in the file.

[b31ngd3v]

hi @iamnandhu i don't think doc-fix is a valid conventional commit type, can you replace it with fix?
and if you are curious and want to learn more about conventional commit, visit https://www.conventionalcommits.org/en/v1.0.0/.

[iamnandhu]

hi @iamnandhu i don't think doc-fix is a valid conventional commit type, can you replace it with fix? and if you are curious and want to learn more about conventional commit, visit https://www.conventionalcommits.org/en/v1.0.0/.

thank you.its my first time contributing:)

[terriko]

Gitlint didn't like the space in "fix :" but I'll fix that during merging. Thank you!