build(deps): bump gatsby-source-filesystem from 2.1.39 to 2.1.40

yarn.lock

@@ -8514,17 +8514,17 @@ gatsby-remark-prismjs@^3.3.22:
     unist-util-visit "^1.4.1"
 
 gatsby-source-filesystem@^2.1.36:
-  version "2.1.39"
-  resolved "https://registry.yarnpkg.com/gatsby-source-filesystem/-/gatsby-source-filesystem-2.1.39.tgz#5d0ae6e532e31378b52101ee82a1aae8941c1bc2"
-  integrity sha512-fOSgq1MdVL4LluGioRQR5eVxQ6j7PlGHXwBjaVug3QM6n1yiYWiHECwyXrjJc6YqKt64l3wShw6CUArjEChVPA==
+  version "2.1.40"
+  resolved "https://registry.yarnpkg.com/gatsby-source-filesystem/-/gatsby-source-filesystem-2.1.40.tgz#482f87a3b1617132b4f4faa64a75d350d8581646"
+  integrity sha512-lCiuNbrb7yl97JjViP+O/TM0rtgDAFJsiebTsY3aUXOzlzIcfVDS7j7ag/H+aGAk9vs1BgGoa+8XSWjP3i90Og==
   dependencies:
     "@babel/runtime" "^7.7.4"
     better-queue "^3.8.10"
     bluebird "^3.7.1"
     chokidar "3.3.0"
     file-type "^12.4.0"
     fs-extra "^8.1.0"
-    gatsby-core-utils "^1.0.21"
+    gatsby-core-utils "^1.0.22"
     got "^7.1.0"
     md5-file "^3.2.3"
     mime "^2.4.4"