Disallow netmasks in devices' ip to prevent overlaps in firewall (#1140)

* fix: disallow netmasks in devices' ip to prevent overlaps in firewall

/32 is still allowed for ipv4 and /128 is still allowed for ipv6.
No migration is needed since netmasks for devices ips were broken
before-hand.

* chore: rename `validate_single_ip` function and reword its error message

* Update pre-commit to allow slash

* fix restore cache

* Refactor a bit

* Fix clobbered restore-keys

* Break cache

Co-authored-by: Jamil Bou Kheir <jamilbk@users.noreply.github.com>

.github/workflows/static_analysis.yml

@@ -33,7 +33,6 @@ jobs:
           key: ${{ runner.os }}-mix-otp-25-${{ hashFiles('**/mix.lock') }}
           restore-keys: |
             ${{ runner.os }}-mix-otp-25-${{ hashFiles('**/mix.lock') }}
-            ${{ runner.os }}-mix-otp-25-
       - uses: actions/cache@v3.0.11
         name: Setup ruby cache
         with: