Remove isovector as an owner (#3700)

Co-authored-by: Michael Peyton Jones <me@michaelpj.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

Author: 3 people

CODEOWNERS

@@ -30,7 +30,7 @@
 /plugins/hls-code-range-plugin @kokobd
 /plugins/hls-splice-plugin @konn
 /plugins/hls-stylish-haskell-plugin @Ailrun
-/plugins/hls-tactics-plugin @isovector
+/plugins/hls-tactics-plugin
 /plugins/hls-stan-plugin @uhbif19
 /plugins/hls-explicit-record-fields-plugin @ozkutuk
 /plugins/hls-overloaded-record-dot-plugin @joyfulmantis