add CVE-2021-23369 and CVE-2021-23383 for handlebars-source

gems/handlebars-source/CVE-2021-23369.yml

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+---
+gem: handlebars-source
+cve: 2021-23369
+ghsa: f2jv-r9rf-7988
+url: https://github.com/advisories/GHSA-f2jv-r9rf-7988
+title: Remote code execution in handlebars when compiling templates
+date: 2021-04-12
+description: |
+  The package handlebars before 4.7.7 are vulnerable to Remote Code Execution (RCE) when
+  selecting certain compiling options to compile templates coming from an untrusted source.
+  This vulnerability has been assigned the CVE identifier CVE-2021-23369.
+
+cvss_v3: 9.8
+patched_versions:
+  - ">= 4.7.7"

gems/handlebars-source/CVE-2021-23383.yml

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+---
+gem: handlebars-source
+cve: 2021-23383
+ghsa: 765h-qjxv-5f44
+url: https://github.com/advisories/GHSA-765h-qjxv-5f44
+title: Prototype Pollution in handlebars
+date: 2021-05-04
+description: |
+  The package handlebars before 4.7.7 are vulnerable to Prototype Pollution when
+  selecting certain compiling options to compile templates coming from an untrusted source.
+  This vulnerability has been assigned the CVE identifier CVE-2021-23383.
+
+cvss_v3: 9.8
+patched_versions:
+  - ">= 4.7.7"