Upgrade to boost 0.77 to match yocto

Tested:
Relying on CI.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: Ie84d88121f4a1c2fd8cded190c5f8dafda983456
diff --git a/scripts/build-unit-test-docker b/scripts/build-unit-test-docker
index ee3c936..5171a2a 100755
--- a/scripts/build-unit-test-docker
+++ b/scripts/build-unit-test-docker
@@ -77,7 +77,7 @@
 # Packages to include in image.
 packages = {
     "boost": PackageDef(
-        rev="1.76.0",
+        rev="1.77.0",
         url=(
             lambda pkg, rev: f"https://downloads.yoctoproject.org/mirror/sources/{pkg}_{rev.replace('.', '_')}.tar.bz2"
         ),