Pin jsonschema to avoid Noble rust version issues

Newer jsonschema requires a version of rustc and cargo
that to not exist in Noble. Pinning jsonschema to native
Noble version to solve.

Change-Id: If2e69c000c0f38313dc1abbb3dc6d66fa38949d9
Signed-off-by: Myles Penner <myles.penner@canonical.com>

charmcraft.yaml

@@ -14,14 +14,7 @@ parts:
       - libssl-dev
       - libxml2-dev
       - libxslt1-dev
-      - rustc-1.76
-      - cargo-1.76
       - pkg-config
-    override-build: |
-      # Note(mylesjp): Force build to use rustc-1.76
-      ln -s /usr/bin/rustc-1.76 /usr/bin/rustc
-      ln -s /usr/bin/cargo-1.76 /usr/bin/cargo
-      craftctl default
     source: src/
     build-snaps:
       - charm/latest/edge

test-requirements.txt

@@ -32,6 +32,7 @@ psycopg2-binary  # vault
 tenacity         # vault
 pbr==5.6.0       # vault
 cryptography<3.4 # vault, keystone-saml-mellon
+jsonschema<=4.10 # Avoid Rust requirement error on Noble
 lxml             # keystone-saml-mellon
 hvac             # vault, barbican-vault
 psutil           # cinder-lvm