Fix multiple reported CVEs

[M4tteoP]

TODOs:

• Check release/push process
  • TETRATE_CI_DOCKERHUB_USERNAME and TETRATE_CI_DOCKERHUB_PASSWORD have been added as repository secrets, still to be tested.
• Investigate a more updated busybox

Before:

▶ grype prometheuscommunity/postgres-exporter:v0.17.1
NAME                 INSTALLED  FIXED-IN         TYPE       VULNERABILITY        SEVERITY  EPSS%  RISK
golang.org/x/crypto  v0.32.0    0.35.0           go-module  GHSA-hcg3-q754-cr77  High      40.88    0.1
golang.org/x/oauth2  v0.24.0    0.27.0           go-module  GHSA-6v2p-p543-phr9  High      23.28  < 0.1
stdlib               go1.23.6   1.23.12, 1.24.6  go-module  CVE-2025-47907       High      16.77  < 0.1
busybox              1.36.1                      binary     CVE-2023-42364       Medium     7.39  < 0.1
busybox              1.36.1                      binary     CVE-2023-42365       Medium     7.39  < 0.1
busybox              1.36.1                      binary     CVE-2023-42363       Medium     5.46  < 0.1
busybox              1.36.1                      binary     CVE-2023-42366       Medium     4.92  < 0.1
stdlib               go1.23.6   1.23.10, 1.24.4  go-module  CVE-2025-4673        Medium     3.10  < 0.1
stdlib               go1.23.6   1.23.8, 1.24.2   go-module  CVE-2025-22871       Critical   0.93  < 0.1
golang.org/x/net     v0.33.0    0.38.0           go-module  GHSA-vvgc-356p-c3xw  Medium     3.31  < 0.1
busybox              1.36.1                      binary     CVE-2024-58251       Low        7.19  < 0.1
golang.org/x/net     v0.33.0    0.36.0           go-module  GHSA-qxp5-gwg8-xv66  Medium     2.13  < 0.1
busybox              1.36.1                      binary     CVE-2025-46394       Low        4.12  < 0.1
stdlib               go1.23.6   1.23.11, 1.24.5  go-module  CVE-2025-4674        High       0.26  < 0.1

After:

▶ grype tetrate/postgres_exporter:fix-cves
NAME     INSTALLED  FIXED-IN  TYPE    VULNERABILITY   SEVERITY  EPSS%  RISK
busybox  1.36.1               binary  CVE-2023-42364  Medium     7.39  < 0.1
busybox  1.36.1               binary  CVE-2023-42365  Medium     7.39  < 0.1
busybox  1.36.1               binary  CVE-2023-42363  Medium     5.46  < 0.1
busybox  1.36.1               binary  CVE-2023-42366  Medium     4.92  < 0.1
busybox  1.36.1               binary  CVE-2024-58251  Low        7.19  < 0.1
busybox  1.36.1               binary  CVE-2025-46394  Low        4.12  < 0.1