debian/changelog: UNRELEASED => unstable

Gbp-Dch: Ignore

debian/changelog

-openexr (2.5.4-2) UNRELEASED; urgency=high
+openexr (2.5.4-2) unstable; urgency=high
 
   * debian/patches/: patchset updated
     - CVE-2021-23169.diff added (Closes: #988240)
@@ -7,7 +7,7 @@ openexr (2.5.4-2) UNRELEASED; urgency=high
     | The patch applied is a reduced version of the upstream
     | commit, given the code base has changed in the meanwhile.
 
- -- Matteo F. Vescovi <mfv@debian.org>  Tue, 18 May 2021 23:22:30 +0200
+ -- Matteo F. Vescovi <mfv@debian.org>  Tue, 18 May 2021 23:26:12 +0200
 
 openexr (2.5.4-1) unstable; urgency=medium