html5: remove parse error around whitespace in template

and update to the latest html5lib-tests

See:
- whatwg/html#7922
- whatwg/html#8271
- html5lib/html5lib-tests#150
- html5lib/html5lib-tests#151

CHANGELOG.md

@@ -33,7 +33,6 @@ This version of Nokogiri uses [`jar-dependencies`](https://github.com/mkristian/
 
 ### Added
 
-* [CRuby] The HTML5 parser handles the [new `search` element](https://github.com/whatwg/html/pull/7320). [#2566](https://github.com/sparklemotion/nokogiri/issues/2566)
 * [CRuby] Invocation of custom XPath or CSS handler functions may now use the `nokogiri` namespace prefix. Historically, the JRuby implementation _required_ this namespace but the CRuby implementation did not support it. It's recommended that all XPath and CSS queries use the `nokogiri` namespace going forward. Invocation without the namespace is planned for deprecation in v1.15.0 and removal in a future release. [[#2147](https://github.com/sparklemotion/nokogiri/issues/2147)]
 
 
@@ -51,6 +50,9 @@ This version of Nokogiri uses [`jar-dependencies`](https://github.com/mkristian/
 
 ### Improved
 
+* HTML5 spec changes:
+ - [Add the <search> element by domenic · whatwg/html](https://github.com/whatwg/html/pull/7320)
+ - [Remove parse error for <template><tr></tr> </template> by zcorpan · whatwg/html](https://github.com/whatwg/html/pull/8271)
 * Serialization of HTML5 documents and fragments has been re-implemented and is ~10x faster than previous versions. [[#2596](https://github.com/sparklemotion/nokogiri/issues/2596), [#2569](https://github.com/sparklemotion/nokogiri/issues/2569)]
 * Parsing of HTML5 documents is ~90% faster thanks to additional compiler optimizations being applied. [[#2639](https://github.com/sparklemotion/nokogiri/issues/2639)]
 * `Document#canonicalize` now raises an exception if `inclusive_namespaces` is non-nil and the mode is inclusive, i.e. XML_C14N_1_0 or XML_C14N_1_1. `inclusive_namespaces` can only be passed with exclusive modes, and previously this silently failed.

gumbo-parser/src/parser.c

@@ -3437,7 +3437,7 @@ static void handle_in_table(GumboParser* parser, GumboToken* token) {
      || token->type == GUMBO_TOKEN_WHITESPACE
      || token->type == GUMBO_TOKEN_NULL)
     && node_tag_in_set(get_current_node(parser), &(const TagSet) {
-      TAG(TABLE), TAG(TBODY), TAG(TFOOT), TAG(THEAD), TAG(TR)
+      TAG(TABLE), TAG(TBODY), TAG(TEMPLATE), TAG(TFOOT), TAG(THEAD), TAG(TR)
     })
   ) {
     // The "pending table character tokens" list described in the spec is