open pr: handle OpenSSL's underscores correctly

The most recent OpenSSL release was announced with underscores in their
version numbers, for some reason, e.g. 1_1_1t.

We already have logic to turn them into dots, but we only handled the
first underscore (reporting a version number `1.1_1t`, see
git-for-windows/MSYS2-packages#83 for an example
with a botched version).

Let's handle all of them underscores, not just the first one. Even if
OpenSSL seems to have re-announced the version with dots now:
git-for-windows/git#4277 (comment)

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

GitForWindowsHelper/component-updates.js

@@ -12,7 +12,8 @@ const guessComponentUpdateDetails = (title, body) => {
 
     version = version
         .replace(/^(GCM |openssl-|OpenSSL_|v|V_|GnuTLS |tig-|Heimdal |cygwin-|PCRE2-|Bash-)/, '')
-        .replace(/_|\s+patch\s+/, '.')
+        .replace(/\s+patch\s+/, '.')
+        .replace(/_/g, '.')
         .replace(/-release$/, '')
 
     return { package_name, version }