github: run nightlies on go1.23 and go1.25

CRDB 25.4 will continue to use go1.23 and we plan to switch directly
to go1.25 for 26.1. Use these two versions in the nightly runs.

Author: RaduBerinde

.github/workflows/nightlies.yaml

@@ -10,7 +10,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        go: [ '1.23', '1.24' ]
+        go: [ '1.23', '1.25' ]
     uses: ./.github/workflows/tests.yaml
     with:
       sha: ${{ github.sha }}
@@ -21,7 +21,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        go: [ '1.23', '1.24' ]
+        go: [ '1.23', '1.25' ]
     uses: ./.github/workflows/s390x.yaml
     with:
       sha: ${{ github.sha }}
@@ -32,7 +32,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        go: [ '1.23', '1.24' ]
+        go: [ '1.23', '1.25' ]
     uses: ./.github/workflows/stress.yaml
     with:
       sha: ${{ github.sha }}
@@ -43,7 +43,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        go: [ '1.23', '1.24' ]
+        go: [ '1.23', '1.25' ]
     uses: ./.github/workflows/instrumented.yaml
     with:
       sha: ${{ github.sha }}