📦 Update com_google_googletest commit hash to e8b478a

[renovate-bot]

This PR contains the following updates:

Package	Update	Type	Change	Package file
com_google_googletest	digest	http_archive	1de637f -> e8b478a	validator/cpp/htmlparser/WORKSPACE

How to resolve breaking changes

This PR may introduce breaking changes that require manual intervention. In such cases, you will need to check out this branch, fix the cause of the breakage, and commit the fix to ensure a green CI build. To check out and update this PR, follow the steps below:

# Check out the PR branch (these steps are from GitHub)
git checkout -b renovate-bot-renovate/validator-devdependencies master
git pull https://github.com/renovate-bot/amphtml.git renovate/validator-devdependencies

# Directly make fixes and commit them
gulp lint --fix # For lint errors in JS files
gulp prettify --fix # For prettier errors in non-JS files
# Edit source code in case of new compiler warnings / errors

# Push the changes to the branch
git push git@github.com:renovate-bot/amphtml.git renovate-bot-renovate/validator-devdependencies:renovate/validator-devdependencies

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[amp-owners-bot]

Hey @ampproject/wg-caching! These files were changed:

validator/cpp/engine/WORKSPACE
validator/cpp/htmlparser/WORKSPACE