Bump 4.5 branch to version 4.5.6.

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4.7

Merge remote-tracking branch 'upstream/4.7-branch' into 4.7-branch

4.6.1

Merge remote-tracking branch 'upstream/4.6-branch' into 4.6-branch

4.6.0

The 4.6 branch is now 4.6.1-alpha.

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4.4.2.1

cherry pick of avoid wp_mkdir_p on every call to wp_upload_dir

4.4.1.1

cherry pick of avoid wp_mkdir_p on every call to wp_upload_dir

4.3.1.1

cherry pick of avoid wp_mkdir_p on every call to wp_upload_dir

4.3.0.1

4.3 with the #c47a51a to reduce wp_mkdir_p calls

4.2.4.1

• avoid wp_mkdir_p on every call to wp_upload_dir, ref https://core.trac.wordpress.org/ticket/31066