[openssl/tools] 988e13: release-tools/stage-release.sh: Update copyright year

[Richard Levitte]

  Branch: refs/heads/master
  Home:   https://github.com/openssl/tools
  Commit: 988e13a8d44b7266cda11c5e6e815c6084451aed
      https://github.com/openssl/tools/commit/988e13a8d44b7266cda11c5e6e815c6084451aed
  Author: Richard Levitte <levitte at openssl.org>
  Date:   2023-05-30 (Tue, 30 May 2023)

  Changed paths:
    M release-tools/stage-release.sh

  Log Message:
  -----------
  release-tools/stage-release.sh: Update copyright year

Reviewed-by: Matt Caswell <matt at openssl.org>
(Merged from https://github.com/openssl/tools/pull/155)