Keep GitHub Actions up to date with GitHub's Dependabot

[cclauss]

• Keeping your software supply chain secure with Dependabot
• Keeping your actions up to date with Dependabot
• Configuration options for the dependabot.yml file - package-ecosystem

To see all GitHub Actions dependencies, type:
% git grep 'uses: ' .github/workflows/

.github/workflows/bit32-multi-arch-tests.yml:      - uses: actions/checkout@v6
.github/workflows/bit32-multi-arch-tests.yml:      - uses: actions/cache@v4
.github/workflows/bit32-multi-arch-tests.yml:      - uses: uraimo/run-on-arch-action@v3
.github/workflows/compat53-tests.yml:      - uses: actions/checkout@v6
.github/workflows/compat53-tests.yml:      - uses: actions/checkout@v7
.github/workflows/compat53-tests.yml:      - uses: luarocks/gh-actions-lua@master
.github/workflows/compat53-tests.yml:      - uses: luarocks/gh-actions-luarocks@master

This will generate a PR to fix the warnings at the bottom of:

• https://github.com/lunarmodules/lua-compat-5.3/actions/runs/29191718758

The GitHub Actions failures are unrelated and are discussed at:

• install failure: the src.rock for 0.15.0 does not contain code for Lua 5.5 #82

[hishamhm]

@cclauss thank you!!

[cclauss]

Generated:

• Bump the github-actions group with 2 updates #85