Update dependency wpackagist-theme/twentysixteen to v2.6

This MR contains the following updates:

Package	Type	Update	Change
wpackagist-theme/twentysixteen (source)	require	minor	2.5 -> 2.6

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patches/themes/0223-twentysixteen-footer.patch

@@ -3,23 +3,23 @@ index 9f1621ff..9e23aed7 100644
 --- a/wp-content/themes/twentysixteen/footer.php
 +++ b/wp-content/themes/twentysixteen/footer.php
 @@ -51,18 +51,13 @@
- 					 */
- 					do_action( 'twentysixteen_credits' );
- 				?>
--				<span class="site-title"><a href="<?php echo esc_url( home_url( '/' ) ); ?>" rel="home"><?php bloginfo( 'name' ); ?></a></span>
-+				<span class="site-title">Proudly powered by <a href="<?php echo esc_url( home_url( '/' ) ); ?>" rel="home"><?php bloginfo( 'name' ); ?></a></span>
- 				<?php
- 				if ( function_exists( 'the_privacy_policy_link' ) ) {
- 					the_privacy_policy_link( '', '<span role="separator" aria-hidden="true"></span>' );
- 				}
- 				?>
--				<a href="<?php echo esc_url( __( 'https://wordpress.org/', 'twentysixteen' ) ); ?>" class="imprint">
--					<?php
--					/* translators: %s: WordPress */
--					printf( __( 'Proudly powered by %s', 'twentysixteen' ), 'WordPress' );
--					?>
--				</a>
-+				and <strong><a href="https://www.autistici.org">R*</a></strong>
- 			</div><!-- .site-info -->
- 		</footer><!-- .site-footer -->
- 	</div><!-- .site-inner -->
+ 					 */
+ 					do_action( 'twentysixteen_credits' );
+ 				?>
+-				<span class="site-title"><a href="<?php echo esc_url( home_url( '/' ) ); ?>" rel="home"><?php bloginfo( 'name' ); ?></a></span>
++				<span class="site-title">Proudly powered by <a href="<?php echo esc_url( home_url( '/' ) ); ?>" rel="home"><?php bloginfo( 'name' ); ?></a></span>
+ 				<?php
+ 				if ( function_exists( 'the_privacy_policy_link' ) ) {
+ 					the_privacy_policy_link( '', '<span role="separator" aria-hidden="true"></span>' );
+ 				}
+ 				?>
+-				<a href="<?php echo esc_url( __( 'https://wordpress.org/', 'twentysixteen' ) ); ?>" class="imprint">
+-					<?php
+-					/* translators: %s: WordPress */
+-					printf( __( 'Proudly powered by %s', 'twentysixteen' ), 'WordPress' );
+-					?>
+-				</a>
++				and <strong><a href="https://www.autistici.org">R*</a></strong>
+ 			</div><!-- .site-info -->
+ 		</footer><!-- .site-footer -->
+ 	</div><!-- .site-inner -->