[CI] Update action variable

Author: ericdallo

.github/workflows/self_check.yml

@@ -8,13 +8,12 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, ubuntu-18.04, macos-latest, windows-latest]
-        clojure-lsp-version: [2021.07.01-19.49.02]
     steps:
       - name: Setup clojure-lsp
         id: setup-clojure-lsp
         uses: clojure-lsp/setup-clojure-lsp@main
         with:
-          clojure-lsp-version: ${{ matrix.clojure-lsp-version }}
+          clojure-lsp-version: 2021.07.01-19.49.02
 
       - name: Check if clojure-lsp runs fine
         run: clojure-lsp --version
@@ -23,7 +22,7 @@ jobs:
         id: setup-clojure-lsp-2
         uses: clojure-lsp/setup-clojure-lsp@main
         with:
-          clojure-lsp-version: ${{ matrix.clojure-lsp-version }}
+          clojure-lsp-version: 2021.07.01-19.49.02
 
       - name: Check if clojure-lsp runs fine from cache
         run: clojure-lsp --version