Remove rust from matrix since it is not used (half the number of tests)

Author: oscargus

.github/workflows/rust.yml

@@ -13,9 +13,6 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        rust:
-          - stable
-          - beta
         os:
           - ubuntu-latest
           - windows-latest
@@ -54,9 +51,6 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        rust:
-          - stable
-          - beta
         toolchain:
           - stable
           - 1.80.0