Sync capa rules submodule

CHANGELOG.md

@@ -6,7 +6,7 @@
 
 ### Breaking Changes
 
-### New Rules (7)
+### New Rules (8)
 
 - persistence/scheduled-tasks/schedule-task-via-at joren485
 - data-manipulation/prng/generate-random-numbers-via-rtlgenrandom william.ballenthin@mandiant.com
@@ -15,6 +15,7 @@
 - executable/installer/dotnet/packaged-as-single-file-dotnet-application michael.hunhoff@mandiant.com
 - communication/socket/create-raw-socket blas.kojusner@mandiant.com
 - communication/http/reference-http-user-agent-string @mr-tz
+- communication/http/get-http-content-length william.ballenthin@mandiant.com
 -
 
 ### Bug Fixes

README.md

@@ -2,7 +2,7 @@
 
 [![PyPI - Python Version](https://img.shields.io/pypi/pyversions/flare-capa)](https://pypi.org/project/flare-capa)
 [![Last release](https://img.shields.io/github/v/release/mandiant/capa)](https://github.com/mandiant/capa/releases)
-[![Number of rules](https://img.shields.io/badge/rules-777-blue.svg)](https://github.com/mandiant/capa-rules)
+[![Number of rules](https://img.shields.io/badge/rules-778-blue.svg)](https://github.com/mandiant/capa-rules)
 [![CI status](https://github.com/mandiant/capa/workflows/CI/badge.svg)](https://github.com/mandiant/capa/actions?query=workflow%3ACI+event%3Apush+branch%3Amaster)
 [![Downloads](https://img.shields.io/github/downloads/mandiant/capa/total)](https://github.com/mandiant/capa/releases)
 [![License](https://img.shields.io/badge/license-Apache--2.0-green.svg)](LICENSE.txt)