mailmap: add entries for Eric and Renovate (sourcegraph#50966)

Was looking at the Contributors graphic for the Sourcegraph repo and
noticed both Eric and Renovate had top commit accounts that could be
combined.

Test Plan: git log --author=Eric only had the sourcegraph.com email
listed.

.mailmap

@@ -58,6 +58,8 @@ Joe Chen <[email protected]> Unknwon <[email protected]>
 Joe Chen <[email protected]> 无闻 <[email protected]>
 Joe Chen <[email protected]> ᴜɴᴋɴᴡᴏɴ <[email protected]>
 Renovate Bot <[email protected]> renovate[bot] <renovate[bot]@users.noreply.github.com>
+Renovate Bot <[email protected]> renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
 Matt King <[email protected]> Matthew King <[email protected]>
 Nico Tonozzi <[email protected]> Dominic Tonozzi <[email protected]>
 Camden Cheek <[email protected]> Camden Cheek <[email protected]>
+Eric Fritz <[email protected]> Eric Fritz <[email protected]>