ci: Lock Ubuntu version on 22.04

These workflows are failing due to `ubuntu-latest` being updated from version `22.04` to `24.04`.

Reference: actions/runner-images#10636

Changelog-None.

Author: ShahanaFarooqui

.github/workflows/bsd.yml

@@ -8,7 +8,7 @@ on:
 
 jobs:
   testfreebsd:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     name: Build and test on FreeBSD
     timeout-minutes: 120
     strategy:

.github/workflows/crate-io.yml

@@ -8,7 +8,7 @@ on:
 
 jobs:
   release_rust:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable

.github/workflows/docker-release.yml

@@ -29,7 +29,7 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
 
     steps:
     - name: Checkout repository

.github/workflows/rdme-docs-sync.yml

@@ -10,7 +10,7 @@ on:
 
 jobs:
   rdme-docs-sync:  
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - name: Check out repo 📚
         uses: actions/checkout@v4

.github/workflows/readme-rpc-sync.yml

@@ -15,7 +15,7 @@ on:
 
 jobs:
   rdme-rpc-sync:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
     - name: Checkout repository
       uses: actions/checkout@v4