fix: pin lol_html to 2.7.0 (#1276)

Author: harmony7

runtime/fastly/crates/rust-lol-html/Cargo.toml

@@ -17,7 +17,7 @@ capi = []
 
 [dependencies]
 encoding_rs = "0.8.35"
-lol_html = "2.6.0"
+lol_html = "=2.7.0"
 libc = "0"
 thiserror = "2"