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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docker/conf/modsecurity/crs/REQUEST-900-EXCLUSION-RULES-BEFORE-CRS.conf

@@ -82,4 +82,11 @@ SecRule REQUEST_URI "@beginsWith /wp-json/wp/v2/widget-types/text/encode" \
     nolog,\
     ctl:ruleEngine=Off"
 
+SecRule REQUEST_URI "@beginsWith /wp-admin/network/site-settings.php" \
+    "id:1009,\
+    phase:2,\
+    pass,\
+    nolog,\
+    ctl:ruleRemoveTargetByTag=OWASP_CRS;ARGS:option[wp-piwik-tracking_code],\
+    ctl:ruleRemoveTargetByTag=OWASP_CRS;ARGS:option[wp-piwik-noscript_code]"