Fixing httpx requests with http2

It seems that passing http2=True is not longer enough to send an http2
request with httpx, http1=False needs to be passed as well

Change-Id: Ia748f8728a494799d34d7130df727b2055d04090
diff --git a/zuul.d/projects.yaml b/zuul.d/projects.yaml
index 41232fd..fee26dd 100644
--- a/zuul.d/projects.yaml
+++ b/zuul.d/projects.yaml
@@ -21,11 +21,10 @@
         - octavia-v2-dsvm-scenario-non-traffic-ops-stable-2024-1
         - octavia-v2-dsvm-scenario-traffic-ops-stable-2023-2
         - octavia-v2-dsvm-scenario-non-traffic-ops-stable-2023-2
-        # TODO(gthiemonge) Re-enable this later, httpx workaround is broken
-        #- octavia-v2-dsvm-tls-barbican
-        #- octavia-v2-dsvm-tls-barbican-stable-2024-2
-        #- octavia-v2-dsvm-tls-barbican-stable-2024-1
-        #- octavia-v2-dsvm-tls-barbican-stable-2023-2
+        - octavia-v2-dsvm-tls-barbican
+        - octavia-v2-dsvm-tls-barbican-stable-2024-2
+        - octavia-v2-dsvm-tls-barbican-stable-2024-1
+        - octavia-v2-dsvm-tls-barbican-stable-2023-2
         - octavia-v2-dsvm-scenario-ipv6-only:
             voting: false
         - octavia-v2-dsvm-scenario-centos-9-stream-traffic-ops:
@@ -70,8 +69,7 @@
         - octavia-v2-dsvm-scenario-non-traffic-ops-stable-2024-1
         - octavia-v2-dsvm-scenario-traffic-ops-stable-2023-2
         - octavia-v2-dsvm-scenario-non-traffic-ops-stable-2023-2
-        # TODO(gthiemonge) Re-enable this later, httpx workaround is broken
-        #- octavia-v2-dsvm-tls-barbican
-        #- octavia-v2-dsvm-tls-barbican-stable-2024-2
-        #- octavia-v2-dsvm-tls-barbican-stable-2024-1
-        #- octavia-v2-dsvm-tls-barbican-stable-2023-2
+        - octavia-v2-dsvm-tls-barbican
+        - octavia-v2-dsvm-tls-barbican-stable-2024-2
+        - octavia-v2-dsvm-tls-barbican-stable-2024-1
+        - octavia-v2-dsvm-tls-barbican-stable-2023-2