Upgrade matrix-js-sdk to 15.0.0-rc.1

package.json

@@ -61,7 +61,7 @@
     "highlight.js": "^11.3.1",
     "jsrsasign": "^10.2.0",
     "katex": "^0.12.0",
-    "matrix-js-sdk": "github:matrix-org/matrix-js-sdk#develop",
+    "matrix-js-sdk": "15.0.0-rc.1",
     "matrix-react-sdk": "github:matrix-org/matrix-react-sdk#develop",
     "matrix-widget-api": "^0.1.0-beta.16",
     "prop-types": "^15.7.2",

yarn.lock

@@ -7776,7 +7776,7 @@ mathml-tag-names@^2.1.3:
   resolved "https://registry.yarnpkg.com/mathml-tag-names/-/mathml-tag-names-2.1.3.tgz#4ddadd67308e780cf16a47685878ee27b736a0a3"
   integrity sha512-APMBEanjybaPzUrfqU0IMU5I0AswKMH7k8OTLs0vvV4KZpExkTkY87nR/zpbuTPj+gARop7aGUbl11pnDfW6xg==
 
-matrix-js-sdk@14.0.1, "matrix-js-sdk@github:matrix-org/matrix-js-sdk#develop":
+matrix-js-sdk@14.0.1:
   version "14.0.1"
   resolved "https://codeload.github.com/matrix-org/matrix-js-sdk/tar.gz/e7b41fadd0d6eda7423a369c99ec7b94afd48d5d"
   dependencies:
@@ -7791,6 +7791,22 @@ matrix-js-sdk@14.0.1, "matrix-js-sdk@github:matrix-org/matrix-js-sdk#develop":
     request "^2.88.2"
     unhomoglyph "^1.0.6"
 
+matrix-js-sdk@15.0.0-rc.1:
+  version "15.0.0-rc.1"
+  resolved "https://registry.yarnpkg.com/matrix-js-sdk/-/matrix-js-sdk-15.0.0-rc.1.tgz#c44e04ba2017eb8e14c8034c2be83cbad8504e01"
+  integrity sha512-BI5ImtPCaOBsS5UETxTYyiL7ePlzfUZAn6c07+QPir6FhD8NeCaW772nWAWRjZNYVWq85UkGRVbvPeVWQvUtAA==
+  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"
+    p-retry "^4.5.0"
+    qs "^6.9.6"
+    request "^2.88.2"
+    unhomoglyph "^1.0.6"
+
 matrix-mock-request@^1.2.3:
   version "1.2.3"
   resolved "https://registry.yarnpkg.com/matrix-mock-request/-/matrix-mock-request-1.2.3.tgz#56b15d86e2601a9b48a854844396d18caab649c8"