deploy-promote: fix parsing of non-self closing tag with wiki version
As of version 1.41.0-wmf.8, the meta tag containing the version in
a wiki version page is no longer self-closing. Regex updated to
account for the change
Bug: T336269
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As of version 1.41.0-wmf.8, the meta tag containing the version in
a wiki version page is no longer self-closing. Regex updated to
account for the change
Bug: T336269