Add kerberos development headers to Redash image (#6454)

Without these headers, compiling pymssql on arm64 fails:

  gcc -pthread -shared build/temp.linux-aarch64-cpython-38/src/pymssql/_mssql.o -L/usr/local/lib -lsybdb -lgssapi_krb5 -lkrb5 -lssl -lcrypto -o build/lib.linux-aarch64-cpython-38/pymssql/_mssql.cpython-38-aarch64-linux-gnu.so
  /usr/bin/ld: cannot find -lgssapi_krb5
  /usr/bin/ld: cannot find -lkrb5
  collect2: error: ld returned 1 exit status

Dockerfile

@@ -42,6 +42,8 @@ RUN apt-get update && \
   libffi-dev \
   sudo \
   git-core \
+  # Kerberos, needed for MS SQL Python driver to compile on arm64
+  libkrb5-dev \
   # Postgres client
   libpq-dev \
   # ODBC support: