Upgrade matrix-js-sdk to 15.6.0-rc.1

package.json

@@ -60,7 +60,7 @@
     "gfm.css": "^1.1.2",
     "jsrsasign": "^10.2.0",
     "katex": "^0.12.0",
-    "matrix-js-sdk": "github:matrix-org/matrix-js-sdk#develop",
+    "matrix-js-sdk": "15.6.0-rc.1",
     "matrix-react-sdk": "github:matrix-org/matrix-react-sdk#develop",
     "matrix-widget-api": "^0.1.0-beta.18",
     "prop-types": "^15.7.2",

yarn.lock

@@ -8093,6 +8093,28 @@ matrix-events-sdk@^0.0.1-beta.6:
   resolved "https://registry.yarnpkg.com/matrix-events-sdk/-/matrix-events-sdk-0.0.1-beta.6.tgz#9001090ed2e2bf29efc113d6b29871bcc6520749"
   integrity sha512-VMqPXe3Bg4R9yC9PNqGv6bDFwWlVYadYxp0Ke1ihhXUCpGcx7e28kOYcqK2T3RxLXK4KK7VH4JRbY53Do3r+Fw==
 
+matrix-events-sdk@^0.0.1-beta.7:
+  version "0.0.1-beta.7"
+  resolved "https://registry.yarnpkg.com/matrix-events-sdk/-/matrix-events-sdk-0.0.1-beta.7.tgz#5ffe45eba1f67cc8d7c2377736c728b322524934"
+  integrity sha512-9jl4wtWanUFSy2sr2lCjErN/oC8KTAtaeaozJtrgot1JiQcEI4Rda9OLgQ7nLKaqb4Z/QUx/fR3XpDzm5Jy1JA==
+
+matrix-js-sdk@15.6.0-rc.1:
+  version "15.6.0-rc.1"
+  resolved "https://registry.yarnpkg.com/matrix-js-sdk/-/matrix-js-sdk-15.6.0-rc.1.tgz#92ce899d778ca1be80b89b146ba35860f3d5ff6e"
+  integrity sha512-kI5SdVipE6BH1x3cxuVhuSqtFdTKfAU2IYoHO75+JaUdorKsS2SHQ+s++NB5yi/v/PNiALTf4vbS9MEPR+zA0A==
+  dependencies:
+    "@babel/runtime" "^7.12.5"
+    another-json "^0.2.0"
+    browser-request "^0.3.3"
+    bs58 "^4.0.1"
+    content-type "^1.0.4"
+    loglevel "^1.7.1"
+    matrix-events-sdk "^0.0.1-beta.7"
+    p-retry "^4.5.0"
+    qs "^6.9.6"
+    request "^2.88.2"
+    unhomoglyph "^1.0.6"
+
 "matrix-js-sdk@github:matrix-org/matrix-js-sdk#develop":
   version "15.5.1"
   resolved "https://codeload.github.com/matrix-org/matrix-js-sdk/tar.gz/2fd08d72dc905e1159176d6fd3afe834261ac6e0"