This patch fixes the issue:

WARNING: libest-3.2.0-r0 do_fetch: Failed to fetch URL git://github.com/cisco/libest, attempting MIRRORS if available
ERROR: libest-3.2.0-r0 do_fetch: Fetcher failure: Unable to find revision 4ca02c6d7540f2b1bcea278a4fbe373daac7103b in branch master even from upstream
ERROR: libest-3.2.0-r0 do_fetch: Fetcher failure for URL: 'git://github.com/cisco/libest'. Unable to fetch URL from any source.

Signed-off-by: Anton Antonov <Anton.Antonov@...>
---
recipes-security/libest/libest_3.2.0.bb | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/recipes-security/libest/libest_3.2.0.bb b/recipes-security/libest/libest_3.2.0.bb
index f993bd6..5b6dc99 100644
--- a/recipes-security/libest/libest_3.2.0.bb
+++ b/recipes-security/libest/libest_3.2.0.bb
@@ -6,7 +6,7 @@ LICENSE = "OpenSSL"
LIC_FILES_CHKSUM = "file://LICENSE;md5=ecb78acde8e3b795de8ef6b61aed5885"

SRCREV = "4ca02c6d7540f2b1bcea278a4fbe373daac7103b"
-SRC_URI = "git://github.com/cisco/libest"
+SRC_URI = "git://github.com/cisco/libest;branch=main"

DEPENDS = "openssl"