Update setup-julia version in solver-tests.yml (#2516)

Author: odow

.github/workflows/solver-tests.yml

@@ -80,7 +80,7 @@ jobs:
           - package: 'UnitJuMP'
     steps:
       - uses: actions/checkout@v4
-      - uses: julia-actions/setup-julia@v1
+      - uses: julia-actions/setup-julia@v2
         with:
           version: '1'
       - uses: julia-actions/cache@v1
@@ -104,7 +104,7 @@ jobs:
           - package: 'CPLEX'
     steps:
       - uses: actions/checkout@v4
-      - uses: julia-actions/setup-julia@v1
+      - uses: julia-actions/setup-julia@v2
         with:
           version: '1'
       - uses: julia-actions/cache@v1
@@ -124,7 +124,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: julia-actions/setup-julia@v1
+      - uses: julia-actions/setup-julia@v2
         with:
           version: '1'
       - uses: julia-actions/cache@v1