Bump react-focus-lock (#7858)

* react-focus-lock to 2.5.1

Signed-off-by: Kerry Archibald <kerrya@element.io>

* use enzyme in ASSD test so focus lock finds active element

Signed-off-by: Kerry Archibald <kerrya@element.io>

* findById and flushPromises to test utils

Signed-off-by: Kerry Archibald <kerrya@element.io>

package.json

@@ -108,7 +108,7 @@
     "react-beautiful-dnd": "^13.1.0",
     "react-blurhash": "^0.1.3",
     "react-dom": "17.0.2",
-    "react-focus-lock": "^2.5.0",
+    "react-focus-lock": "^2.5.1",
     "react-transition-group": "^4.4.1",
     "rfc4648": "^1.4.0",
     "sanitize-html": "^2.3.2",