Update feign monorepo to v13.6 (#1220)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Feli Tam <[email protected]>

Author: renovate[bot]

build.gradle

@@ -164,7 +164,7 @@ def versions = [
         commonsBeanutils                : '1.11.0',
         commonsIO                       : '2.19.0',
         commonMark                      : '0.17.0',
-        feign                           : '13.5',
+        feign                           : '13.6',
         fortifyClient                   : '1.4.9',
         hmctsJavaLogging                : '6.1.9',
         jacksonDatabind                 : '2.19.1',