feat(assets): update MermaidJS to 8.8.0

8.7.0 introduced new theming system. However, appears no changes necessary as they state "Site-wide themes are still declared via initialize" - see http://mermaid-js.github.io/mermaid/tutorials-and-community/CHANGELOG.html#870-2020-08-09

See https://github.com/wowchemy/wowchemy-hugo-modules/discussions/1860

wowchemy/data/assets.toml

@@ -57,8 +57,8 @@
   sri = "sha512-I7w3ZdSFzw5j3jU3ZkNikBNeIrl3i+hEuEdwNmqUJvwNcaBUNcijnP2gd9DtGlgVYDplfjGoD8vTNsID+lCjqg=="
   url = "https://cdnjs.cloudflare.com/ajax/libs/anchor-js/%s/anchor.min.js"
 [js.mermaid]
-  version = "8.4.8"
-  sri = "sha256-lyWCDMnMeZiXRi7Zl54sZGKYmgQs4izcT7+tKc+KUBk="
+  version = "8.8.0"
+  sri = "sha512-ja+hSBi4JDtjSqc4LTBsSwuBT3tdZ3oKYKd07lTVYmCnTCor56AnRql00ssqnTOR9Ss4gOP/ROGB3SfcJnZkeg=="
   url = "https://cdnjs.cloudflare.com/ajax/libs/mermaid/%s/mermaid.min.js"
 [js.lazysizes]
   version = "5.2.2"