Add security override for sha1 #14

Job	Run time
cmake-offline-googletest	4m 16s
cmake-offline-googletest-src	4m 24s
system-sexpp, sexpp shared libs on, rnp shared libs on	2m 54s
system-sexpp, sexpp shared libs on, rnp shared libs off	2m 54s
system-sexpp, sexpp shared libs off, rnp shared libs on	2m 49s
package-source	1m 15s
system-sexpp, sexpp shared libs off, rnp shared libs off	3m 4s
ubuntu-latest [CC gcc; botan; shared libs on; GnuPG stable]	4m 37s
ubuntu-latest [CC clang; botan; shared libs on; GnuPG stable]	5m 38s
ubuntu-latest [CC gcc; openssl; shared libs on; GnuPG stable]	4m 1s
ubuntu-latest [CC clang; openssl; shared libs on; GnuPG stable]	3m 58s
ubuntu-20.04 [CC gcc; openssl; shared libs on; GnuPG stable]	3m 44s
ubuntu-latest [CC gcc; botan; shared libs off; GnuPG stable]	4m 53s
package	48s
debian-tests	12s
	49m 27s

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