Release bugfix v2.6.3 Stable Tag 2.6.3.

Overdue bugfix, cannot be delayed.
Also the project has to demonstrate it’s still ready to **release** bugfixes.
Per SemVer the minor version number cannot be incremented for the below.
= 2.6.3 =
- Bugfix: Reference container: debug footnotes number text color in the table header cells required for accessibility, thanks to @spaceling bug report.
- Bugfix: Excerpts: debug the 'Yes' option by generating excerpts with footnotes on the basis of the posts, thanks to @nikelaos @martinneumannat bug reports.
- Bugfix: Reference container: debug span elements in backlinks by removing 'event.stopPropagation()' from jQuery scroll down function, thanks to @lolzim bug report.
- Update: Excerpts: set the default value of the debugged 'Footnotes in excerpts' setting to Yes.
- Update: Excerpts: enable the hook 'the_excerpt' by default to make the debugged 'Footnotes in excerpts' setting effective.

git-svn-id: https://plugins.svn.wordpress.org/footnotes/trunk@2506333 b8457f37-d9ea-0310-8a92-e5e31aec5664

footnotes.php

@@ -4,7 +4,7 @@
  * Plugin URI: https://wordpress.org/plugins/footnotes/
  * Description: time to bring footnotes to your website! footnotes are known from offline publishing and everybody takes them for granted when reading a magazine.
  * Author: Mark Cheret
- * Package V.: 2.6.3d0
+ * Package V.: 2.6.3
  * Version: 2.6.3
  * CAUTION: THIS V. FIELD IS PARSED FOR UPDATE CONFIGURATION.
  * Author URI: https://cheret.org/footnotes/
@@ -21,9 +21,9 @@
  * @since 2.1.4
  * @since 2.5.3 (Hungarian)
  * @var str
- * @lastmodified 2021-03-29T2014+0200
+ * @lastmodified 2021-03-30T1135+0200
  */
-define( 'C_STR_PACKAGE_VERSION', '2.6.3d0' );
+define( 'C_STR_PACKAGE_VERSION', '2.6.3' );
 /**
  * Enables toggling the stylesheet enqueuing mode from production (true) to development (false).
  * @see Full docblock below next.