[PR PATCH] burp2-serveur: fix unstable release detection

[yopito <yopito@users.noreply.github.com>]

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There is a new pull request by yopito against master on the void-packages repository

https://github.com/yopito/void-packages burp2-server.fix.update.check
https://github.com/void-linux/void-packages/pull/31590

burp2-serveur: fix unstable release detection
<!-- Mark items with [x] where applicable -->

#### General
- [ ] This is a new package and it conforms to the [quality requirements](https://github.com/void-linux/void-packages/blob/master/Manual.md#quality-requirements)

#### Have the results of the proposed changes been tested?
- [x] I use the packages affected by the proposed changes on a regular basis and confirm this PR works for me
- [ ] I generally don't use the affected packages but briefly tested this PR

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A patch file from https://github.com/void-linux/void-packages/pull/31590.patch is attached

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From 4e80b76b3ead43c141dbb568f01171e4307a489c Mon Sep 17 00:00:00 2001
From: yopito <pierre.bourgin@free.fr>
Date: Sun, 20 Jun 2021 22:27:35 +0200
Subject: [PATCH] burp2-serveur: fix unstable release detection

---
 srcpkgs/burp2-server/update | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/srcpkgs/burp2-server/update b/srcpkgs/burp2-server/update
index a07b270a9807..1564ce41cb88 100644
--- a/srcpkgs/burp2-server/update
+++ b/srcpkgs/burp2-server/update
@@ -1,3 +1,3 @@
 pkgname=burp
-# 2019-02: 2.3.x are latest releases (unstable)
-ignore="2.3.*"
+# unstable releases
+ignore="?.[3579].*"