upgrade stdlib, @observablehq/plot 0.6.13 (#369)

Author: Fil

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@observablehq/runtime",
-  "version": "5.9.6",
+  "version": "5.9.7",
   "author": {
     "name": "Observable, Inc.",
     "url": "https://observablehq.com"

yarn.lock

@@ -126,9 +126,9 @@
     isoformat "^0.2.0"
 
 "@observablehq/stdlib@^5.0.0":
-  version "5.8.5"
-  resolved "https://registry.yarnpkg.com/@observablehq/stdlib/-/stdlib-5.8.5.tgz#f547239c26db1c8bbf24a144dfdee6e237c0b285"
-  integrity sha512-EnPH8Hk4bTYYkJkcPIE70cFMD6gC3oF0+X74qkqMsq7c1dDGUnjSl/M8RQv/hTlALLUNmjYHuiKZwapqrenAbA==
+  version "5.8.6"
+  resolved "https://registry.yarnpkg.com/@observablehq/stdlib/-/stdlib-5.8.6.tgz#225af7f986628accf162f7926f5b72b573dc8db2"
+  integrity sha512-kJZ2B0IVAatZM8IDILZITCRJJiuYlwJwI6Gc/Mmt+aIMSYLxSQMmnf52Kmh+IufPvWCgkN1IY/1+Z10kH/xIsA==
   dependencies:
     d3-array "^3.2.0"
     d3-dsv "^3.0.1"