Bump c-slang to 1.0.21 (#3057)

Author: RichDom2185

package.json

@@ -34,7 +34,7 @@
     "@octokit/rest": "^20.0.0",
     "@reduxjs/toolkit": "^1.9.7",
     "@sentry/browser": "^7.57.0",
-    "@sourceacademy/c-slang": "^1.0.20",
+    "@sourceacademy/c-slang": "^1.0.21",
     "@sourceacademy/sharedb-ace": "^2.0.3",
     "@sourceacademy/sling-client": "^0.1.0",
     "@szhsin/react-menu": "^4.0.0",

yarn.lock

@@ -2438,10 +2438,10 @@
   dependencies:
     "@sinonjs/commons" "^1.7.0"
 
-"@sourceacademy/c-slang@^1.0.20":
-  version "1.0.20"
-  resolved "https://registry.yarnpkg.com/@sourceacademy/c-slang/-/c-slang-1.0.20.tgz#d2d3ecc77316d07ad87a302d979cd4688055c75d"
-  integrity sha512-nbRjzL2bUzurbPiENc270WnmcS11nu82Yq7JFV5dFCR/PqGdf/X7+2dV/1ltEoQwFjUEur+u4Ek4OY0drgEZXQ==
+"@sourceacademy/c-slang@^1.0.21":
+  version "1.0.21"
+  resolved "https://registry.yarnpkg.com/@sourceacademy/c-slang/-/c-slang-1.0.21.tgz#a292d68a2993af2e1466bf8fc018c24c3af35e4d"
+  integrity sha512-sny7mTJtzfeJC0Uflubfl50deElcl6/jT5DFazv1D7zr7v2CCevrAk9c7vrXmHV3mA6BpovYgwykZmIrYSWSNg==
   dependencies:
     bignumber.js "^9.1.2"
     peggy "^3.0.2"